forked from maxkleiner/python4delphi
-
Notifications
You must be signed in to change notification settings - Fork 0
/
Copy pathpydemo3.htm
373 lines (332 loc) · 58.4 KB
/
pydemo3.htm
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
Version:0.9
StartHTML:0000000105
EndHTML:0000059770
StartFragment:0000001053
EndFragment:0000059754
<?xml version="1.0" encoding="iso-8859-1"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>mXScriptasHTML</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<meta name="generator" content="SynEdit HTML exporter" />
<style type="text/css">
<!--
body { color: #000000; background-color: #FFFFFF; }
.pas1-assembler { }
.pas1-character { color: #0066CC; text-decoration: underline; }
.pas1-comment { color: #000080; font-style: italic; }
.pas1-float { color: #00FF00; }
.pas1-hexadecimal { color: #FF00FF; }
.pas1-identifier { }
.pas1-number { color: #FF0000; }
.pas1-preprocessor { font-style: italic; }
.pas1-reservedword { color: #000080; font-weight: bold; }
.pas1-space { }
.pas1-string { color: #008080; }
.pas1-symbol { color: #FF0000; }
-->
</style>
</head>
<body>
<!--StartFragment--><pre><code><span class="pas1-reservedword">Program</span><span class="pas1-space"> PyDemo5_Eval_Exec5_10Pythontips</span><span class="pas1-symbol">;
</span><span class="pas1-comment">//https://betterprogramming.pub/10-python-tips-for-competitive-programming-bae8375dd73b
//https://github.com/maxkleiner/python4delphi/blob/master/Demos/Demo02/Unit1.pas
//https://stackoverflow.com/questions/21464102/reset-python4delphi-engine
//https://thepythonguru.com/python-builtin-functions/eval/
//https://maxbox4.wordpress.com/2021/07/28/python4maxbox-code/
//https://stackoverflow.com/questions/359498/how-can-i-unload-a-dll-using-ctypes-in-python
//https://levelup.gitconnected.com/5-powerful-python-one-liners-you-should-know-469b9c4737c7
//interface - customize your PY environment first
{uses
Classes, SysUtils,
Windows, Messages, Graphics, Controls, Forms, Dialogs,
StdCtrls, ComCtrls, ExtCtrls,
PythonEngine, Vcl.PythonGUIInputOutput, PythonVersions.pas ; }</span><span class="pas1-space">
</span><span class="pas1-comment">{procedure PyFinalize();
external
'Py_Finalize@C:\Users\breitsch\AppData\Local\Programs\Python\Python37-32\python37.dll stdcall'; }</span><span class="pas1-space">
</span><span class="pas1-comment">//Note: modify PYHOME and PYDLL :
</span><span class="pas1-reservedword">const</span><span class="pas1-space"> </span><span class="pas1-comment">//PYHOME = 'C:\Users\breitsch\AppData\Local\Programs\Python\Python37-32\';
</span><span class="pas1-space"> PYHOME </span><span class="pas1-symbol">=</span><span class="pas1-space"> </span><span class="pas1-string">'C:\Users\max\AppData\Local\Programs\Python\Python36-32\'</span><span class="pas1-symbol">;
</span><span class="pas1-space"> PYDLL </span><span class="pas1-symbol">=</span><span class="pas1-space"> </span><span class="pas1-string">'C:\Users\max\AppData\Local\Programs\Python\Python36-32\python36.dll'</span><span class="pas1-symbol">;</span><span class="pas1-space">
PYSCRIPT </span><span class="pas1-symbol">=</span><span class="pas1-space"> </span><span class="pas1-string">'C:\maXbox\maxbox3\maxbox3\maXbox3\examples\module1maxbox1.py'</span><span class="pas1-symbol">;
</span><span class="pas1-space"> PYSCRIPT2</span><span class="pas1-symbol">=</span><span class="pas1-space"> </span><span class="pas1-string">'C:\maXbox\maxbox3\maXbox4\examples\896_textclassification.py'</span><span class="pas1-symbol">;
</span><span class="pas1-space"> LB </span><span class="pas1-symbol">=</span><span class="pas1-space"> CR</span><span class="pas1-symbol">+</span><span class="pas1-identifier">LF</span><span class="pas1-symbol">;
</span><span class="pas1-space">
</span><span class="pas1-reservedword">const</span><span class="pas1-space"> PyModule </span><span class="pas1-symbol">=
</span><span class="pas1-space"> </span><span class="pas1-string">'def printData(data): '</span><span class="pas1-symbol">+</span><span class="pas1-character">#13#10</span><span class="pas1-symbol">+
</span><span class="pas1-space"> </span><span class="pas1-string">' return data+data+"/n"'</span><span class="pas1-symbol">;</span><span class="pas1-space">
</span><span class="pas1-reservedword">const</span><span class="pas1-space"> PYCMD </span><span class="pas1-symbol">=</span><span class="pas1-space"> </span><span class="pas1-string">'print("this is box")'</span><span class="pas1-symbol">+</span><span class="pas1-identifier">LB</span><span class="pas1-symbol">+</span><span class="pas1-space">
</span><span class="pas1-string">'import sys'</span><span class="pas1-symbol">+</span><span class="pas1-identifier">LB</span><span class="pas1-symbol">+</span><span class="pas1-space">
</span><span class="pas1-string">'f=open(r"1050pytest21_5powers.txt","w")'</span><span class="pas1-symbol">+</span><span class="pas1-identifier">LB</span><span class="pas1-symbol">+
</span><span class="pas1-space"> </span><span class="pas1-string">'f.write("Hello PyWorld_mX47580, \n")'</span><span class="pas1-symbol">+</span><span class="pas1-identifier">LB</span><span class="pas1-symbol">+
</span><span class="pas1-space"> </span><span class="pas1-string">'f.write("This data will be written on the file.")'</span><span class="pas1-symbol">+</span><span class="pas1-identifier">LB</span><span class="pas1-symbol">+</span><span class="pas1-space">
</span><span class="pas1-string">'f.close()'</span><span class="pas1-symbol">;
</span><span class="pas1-space">
</span><span class="pas1-reservedword">var</span><span class="pas1-space"> myloadscript</span><span class="pas1-symbol">:</span><span class="pas1-space"> </span><span class="pas1-reservedword">string</span><span class="pas1-symbol">;
</span><span class="pas1-space"> PyForm</span><span class="pas1-symbol">:</span><span class="pas1-space"> TForm</span><span class="pas1-symbol">;</span><span class="pas1-space"> pyMemo</span><span class="pas1-symbol">:</span><span class="pas1-space"> TMemo</span><span class="pas1-symbol">;
</span><span class="pas1-space"> avar</span><span class="pas1-symbol">:</span><span class="pas1-space"> </span><span class="pas1-reservedword">string</span><span class="pas1-symbol">;</span><span class="pas1-space"> pyval</span><span class="pas1-symbol">:</span><span class="pas1-space"> variant</span><span class="pas1-symbol">;</span><span class="pas1-space"> pyint</span><span class="pas1-symbol">:</span><span class="pas1-space"> integer</span><span class="pas1-symbol">;
</span><span class="pas1-space">
</span><span class="pas1-reservedword">function</span><span class="pas1-space"> AddWhereClause4</span><span class="pas1-symbol">:</span><span class="pas1-space"> </span><span class="pas1-reservedword">string</span><span class="pas1-symbol">;
</span><span class="pas1-space"> </span><span class="pas1-reservedword">var
</span><span class="pas1-space"> Start</span><span class="pas1-symbol">:</span><span class="pas1-space"> PChar</span><span class="pas1-symbol">;
</span><span class="pas1-space"> Rest</span><span class="pas1-symbol">,</span><span class="pas1-space"> FName</span><span class="pas1-symbol">,</span><span class="pas1-space"> SQL</span><span class="pas1-symbol">:</span><span class="pas1-space"> </span><span class="pas1-reservedword">string</span><span class="pas1-symbol">;
</span><span class="pas1-space"> SQLToken</span><span class="pas1-symbol">,</span><span class="pas1-space"> CurSection</span><span class="pas1-symbol">:</span><span class="pas1-space"> TSQLToken</span><span class="pas1-symbol">;
</span><span class="pas1-space"> </span><span class="pas1-reservedword">begin
</span><span class="pas1-space"> Start </span><span class="pas1-symbol">:=</span><span class="pas1-space"> PChar</span><span class="pas1-symbol">(</span><span class="pas1-identifier">SQL</span><span class="pas1-symbol">);
</span><span class="pas1-space"> CurSection </span><span class="pas1-symbol">:=</span><span class="pas1-space"> stUnknown</span><span class="pas1-symbol">;
</span><span class="pas1-space"> </span><span class="pas1-reservedword">repeat
</span><span class="pas1-space"> SQLToken </span><span class="pas1-symbol">:=</span><span class="pas1-space"> NextSQLToken</span><span class="pas1-symbol">(</span><span class="pas1-identifier">Start</span><span class="pas1-symbol">,</span><span class="pas1-space"> FName</span><span class="pas1-symbol">,</span><span class="pas1-space"> CurSection</span><span class="pas1-symbol">);
</span><span class="pas1-space"> </span><span class="pas1-reservedword">until</span><span class="pas1-space"> SQLToken </span><span class="pas1-reservedword">in</span><span class="pas1-space"> </span><span class="pas1-symbol">[</span><span class="pas1-identifier">stFrom</span><span class="pas1-symbol">,</span><span class="pas1-space"> stEnd</span><span class="pas1-symbol">];
</span><span class="pas1-space"> </span><span class="pas1-reservedword">if</span><span class="pas1-space"> SQLToken </span><span class="pas1-symbol">=</span><span class="pas1-space"> stFrom </span><span class="pas1-reservedword">then
</span><span class="pas1-space"> NextSQLToken</span><span class="pas1-symbol">(</span><span class="pas1-identifier">Start</span><span class="pas1-symbol">,</span><span class="pas1-space"> FName</span><span class="pas1-symbol">,</span><span class="pas1-space"> CurSection</span><span class="pas1-symbol">);
</span><span class="pas1-space"> Rest </span><span class="pas1-symbol">:=</span><span class="pas1-space"> </span><span class="pas1-reservedword">string</span><span class="pas1-symbol">(</span><span class="pas1-identifier">Start</span><span class="pas1-symbol">);
</span><span class="pas1-space"> </span><span class="pas1-reservedword">if</span><span class="pas1-space"> Rest </span><span class="pas1-symbol">=</span><span class="pas1-space"> </span><span class="pas1-string">''</span><span class="pas1-space"> </span><span class="pas1-reservedword">then
</span><span class="pas1-space"> Result </span><span class="pas1-symbol">:=</span><span class="pas1-space"> SQL </span><span class="pas1-symbol">+</span><span class="pas1-space"> </span><span class="pas1-string">' '</span><span class="pas1-space"> </span><span class="pas1-comment">{+ GenerateParamSQL }
</span><span class="pas1-space"> </span><span class="pas1-reservedword">else
</span><span class="pas1-space"> Result </span><span class="pas1-symbol">:=</span><span class="pas1-space"> Copy</span><span class="pas1-symbol">(</span><span class="pas1-identifier">SQL</span><span class="pas1-symbol">,</span><span class="pas1-space"> </span><span class="pas1-number">1,</span><span class="pas1-space"> pos</span><span class="pas1-symbol">(</span><span class="pas1-identifier">Rest</span><span class="pas1-symbol">,</span><span class="pas1-space"> SQL</span><span class="pas1-symbol">))</span><span class="pas1-space"> </span><span class="pas1-symbol">+</span><span class="pas1-space"> </span><span class="pas1-string">' '</span><span class="pas1-space"> </span><span class="pas1-symbol">+</span><span class="pas1-space"> </span><span class="pas1-comment">{GenerateParamSQL +}</span><span class="pas1-space"> Rest</span><span class="pas1-symbol">;
</span><span class="pas1-space"> </span><span class="pas1-comment">//DecomposeDatabaseName
</span><span class="pas1-space"> </span><span class="pas1-reservedword">end</span><span class="pas1-symbol">;
</span><span class="pas1-reservedword">Procedure</span><span class="pas1-space"> PYLaz_P4D_Demo2</span><span class="pas1-symbol">;
</span><span class="pas1-comment">//https://wiki.freepascal.org/Python4Delphi
</span><span class="pas1-reservedword">var</span><span class="pas1-space"> eng </span><span class="pas1-symbol">:</span><span class="pas1-space"> TPythonEngine</span><span class="pas1-symbol">;
</span><span class="pas1-space"> Out1</span><span class="pas1-symbol">:</span><span class="pas1-space"> TPythonGUIInputOutput</span><span class="pas1-symbol">;
</span><span class="pas1-space"> pystrings</span><span class="pas1-symbol">:</span><span class="pas1-space"> TStrings</span><span class="pas1-symbol">;
</span><span class="pas1-reservedword">begin
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">:=</span><span class="pas1-space"> TPythonEngine</span><span class="pas1-symbol">.</span><span class="pas1-identifier">Create</span><span class="pas1-symbol">(</span><span class="pas1-reservedword">Nil</span><span class="pas1-symbol">);
</span><span class="pas1-space"> Out1</span><span class="pas1-symbol">:=</span><span class="pas1-space"> TPythonGUIInputOutput</span><span class="pas1-symbol">.</span><span class="pas1-identifier">create</span><span class="pas1-symbol">(</span><span class="pas1-reservedword">nil</span><span class="pas1-symbol">)
</span><span class="pas1-space"> Out1</span><span class="pas1-symbol">.</span><span class="pas1-identifier">output</span><span class="pas1-symbol">:=</span><span class="pas1-space"> pyMemo</span><span class="pas1-symbol">;</span><span class="pas1-space"> </span><span class="pas1-comment">//debugout.output; or memo2;
</span><span class="pas1-space"> Out1</span><span class="pas1-symbol">.</span><span class="pas1-identifier">RawOutput</span><span class="pas1-symbol">:=</span><span class="pas1-space"> True</span><span class="pas1-symbol">;
</span><span class="pas1-space"> Out1</span><span class="pas1-symbol">.</span><span class="pas1-identifier">UnicodeIO</span><span class="pas1-symbol">:=</span><span class="pas1-space"> False</span><span class="pas1-symbol">;
</span><span class="pas1-space"> Out1</span><span class="pas1-symbol">.</span><span class="pas1-identifier">maxlines</span><span class="pas1-symbol">:=</span><span class="pas1-space"> </span><span class="pas1-number">20;
</span><span class="pas1-space"> out1</span><span class="pas1-symbol">.</span><span class="pas1-identifier">displaystring</span><span class="pas1-symbol">(</span><span class="pas1-string">'this string thing draw the line'</span><span class="pas1-symbol">)
</span><span class="pas1-space">
writeln</span><span class="pas1-symbol">(</span><span class="pas1-identifier">botostr</span><span class="pas1-symbol">(</span><span class="pas1-identifier">Isx64</span><span class="pas1-symbol">(</span><span class="pas1-identifier">PYDLL</span><span class="pas1-symbol">)));
</span><span class="pas1-space"> </span><span class="pas1-comment">//writeln(botostr(Isx64(pydllpath2)));
</span><span class="pas1-space"> </span><span class="pas1-comment">//eng.dllpath:= exepath;
</span><span class="pas1-space"> </span><span class="pas1-comment">//eng.dllname:='python37.dll';
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">pythonhome</span><span class="pas1-symbol">:=</span><span class="pas1-space"> PYHOME</span><span class="pas1-symbol">;
</span><span class="pas1-space"> </span><span class="pas1-reservedword">try
</span><span class="pas1-space"> </span><span class="pas1-comment">//pymod.InitializeForNewInterpreter; //}
</span><span class="pas1-space"> </span><span class="pas1-comment">//pymod.engine:= eng;
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">opendll</span><span class="pas1-symbol">(</span><span class="pas1-identifier">PYDLL</span><span class="pas1-symbol">)
</span><span class="pas1-space"> </span><span class="pas1-comment">//eng.loadDLL;
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">IO</span><span class="pas1-symbol">:=</span><span class="pas1-space"> Out1</span><span class="pas1-symbol">;
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">traceback
eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">AutoFinalize</span><span class="pas1-symbol">:=</span><span class="pas1-space"> True</span><span class="pas1-symbol">;</span><span class="pas1-space">
</span><span class="pas1-comment">//eng.AutoUnload:= false;
</span><span class="pas1-space"> writeln</span><span class="pas1-symbol">(</span><span class="pas1-identifier">eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">dllname</span><span class="pas1-symbol">);
</span><span class="pas1-space"> </span><span class="pas1-comment">//pymod.engine:= eng;
</span><span class="pas1-space"> </span><span class="pas1-reservedword">if</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">IsHandleValid </span><span class="pas1-reservedword">then</span><span class="pas1-space"> </span><span class="pas1-reservedword">begin
</span><span class="pas1-space"> writeln</span><span class="pas1-symbol">(</span><span class="pas1-string">'DLLhandle: '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">botostr</span><span class="pas1-symbol">(</span><span class="pas1-identifier">eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">IsHandleValid</span><span class="pas1-symbol">))
</span><span class="pas1-space"> WriteLn</span><span class="pas1-symbol">(</span><span class="pas1-string">'evens: '</span><span class="pas1-symbol">+</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStringAsStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'[x**2 for x in range(15)]'</span><span class="pas1-symbol">));
</span><span class="pas1-space"> WriteLn</span><span class="pas1-symbol">(</span><span class="pas1-string">'gauss: '</span><span class="pas1-symbol">+</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStringAsStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'sum([x for x in range(101)])'</span><span class="pas1-symbol">));
</span><span class="pas1-space"> WriteLn</span><span class="pas1-symbol">(</span><span class="pas1-string">'gauss2: '</span><span class="pas1-symbol">+</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'sum([x % 2 for x in range(10100)])'</span><span class="pas1-symbol">));
</span><span class="pas1-space">
WriteLn</span><span class="pas1-symbol">(</span><span class="pas1-string">'powerline1: '</span><span class="pas1-symbol">+</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'list(map(int, ["1", "2", "3"]))'</span><span class="pas1-symbol">));
</span><span class="pas1-space"> WriteLn</span><span class="pas1-symbol">(</span><span class="pas1-string">'powerline2: '</span><span class="pas1-symbol">+</span><span class="pas1-space">
eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'list(map(float,["1",2,"3.0",4.0,"5",6]))'</span><span class="pas1-symbol">));
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">Execstring</span><span class="pas1-symbol">(</span><span class="pas1-string">'sum_of_digits=lambda x: sum(map(int, str(x)))'</span><span class="pas1-symbol">);
</span><span class="pas1-space"> WriteLn</span><span class="pas1-symbol">(</span><span class="pas1-string">'powerline3: '</span><span class="pas1-symbol">+</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'sum_of_digits(1789)'</span><span class="pas1-symbol">));
</span><span class="pas1-space">
eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">Execstring</span><span class="pas1-symbol">(</span><span class="pas1-string">'A = [[1, 2, 3], [4, 5, 6], [7, 8, 9]]'</span><span class="pas1-symbol">);
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">Execstring</span><span class="pas1-symbol">(</span><span class="pas1-string">'transpose_A = [list(i) for i in zip(*A)]'</span><span class="pas1-symbol">);
</span><span class="pas1-space"> WriteLn</span><span class="pas1-symbol">(</span><span class="pas1-string">'powerline4: '</span><span class="pas1-symbol">+</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'transpose_A'</span><span class="pas1-symbol">));</span><span class="pas1-space">
eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">ExecString</span><span class="pas1-symbol">(</span><span class="pas1-string">'print("powers:",[x**2 for x in range(10)])'</span><span class="pas1-symbol">);
</span><span class="pas1-space"> writeln</span><span class="pas1-symbol">(</span><span class="pas1-string">'ExecSynCheck1 '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">botostr</span><span class="pas1-symbol">(</span><span class="pas1-identifier">eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">CheckExecSyntax</span><span class="pas1-symbol">(</span><span class="pas1-identifier">PYCMD</span><span class="pas1-symbol">)));
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">ExecString</span><span class="pas1-symbol">(</span><span class="pas1-identifier">PYCMD</span><span class="pas1-symbol">);
</span><span class="pas1-space">
</span><span class="pas1-comment">(* eng.ExecString('import subprocess');
eng.ExecString('subprocess.call(["pip", "install", "sympy"])')
eng.ExecString('from sympy import *');
eng.ExecString('from sympy.plotting import plot');
writeln(eng.EvalStr('list(primerange(7, 150))'));
writeln(eng.EvalStr('sum(list(primerange(0, 100)))'));
writeln(eng.EvalStr('(list(primerange(0, 101)))'));
writeln(eng.EvalStr('len(list(primerange(0, 101)))'));
//https://www.tutorialspoint.com/sympy/sympy_solvers.htm
avar:= '-2';
eng.ExecString('x=Symbol("x")');
eng.ExecString('x,y=symbols("x y")');
writeln(eng.EvalStr('solveset(Eq(x**2-9,0), x)'));
writeln(eng.EvalStr('solveset(Eq(x**2-3*x,'+avar+'),x)'));
writeln(eng.EvalStr('solveset(exp(x),x)'));
println(eng.EvalStr('linsolve([Eq(x-y,4),Eq( x + y ,1) ], (x, y))'));
*)
</span><span class="pas1-space">
</span><span class="pas1-comment">//eng.ExecString('plot(x**'+avar+', line_color="red")');
</span><span class="pas1-space"> </span><span class="pas1-comment">//eng.ExecString('plot((sin(x),(x, -2*pi, 2*pi)),(cos(x), (x, -pi, pi)))');
</span><span class="pas1-space"> </span><span class="pas1-comment">{
eng.ExecString('from sympy.plotting import plot3d');
eng.ExecString('x,y=symbols("x y") ');
eng.ExecString('plot3d(x*y, (x, -10,10), (y, -10,10))'); }
</span><span class="pas1-space">
WriteLn</span><span class="pas1-symbol">(</span><span class="pas1-string">'powerline6: '</span><span class="pas1-symbol">+</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'len(str(2**4096))'</span><span class="pas1-symbol">));
</span><span class="pas1-space"> pymemo</span><span class="pas1-symbol">.</span><span class="pas1-identifier">lines</span><span class="pas1-symbol">.</span><span class="pas1-identifier">add</span><span class="pas1-symbol">(</span><span class="pas1-string">'Decimal: '</span><span class="pas1-symbol">+</span><span class="pas1-space">
eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'__import__("decimal").Decimal((0,(3,1,4),-2))'</span><span class="pas1-symbol">));
</span><span class="pas1-space"> pymemo</span><span class="pas1-symbol">.</span><span class="pas1-identifier">lines</span><span class="pas1-symbol">.</span><span class="pas1-identifier">add</span><span class="pas1-symbol">(</span><span class="pas1-string">'Decimal: '</span><span class="pas1-symbol">+</span><span class="pas1-space">
eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'__import__("decimal").Decimal(0.1)'</span><span class="pas1-symbol">));</span><span class="pas1-space">
eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">ExecString</span><span class="pas1-symbol">(</span><span class="pas1-string">'import decimal'</span><span class="pas1-symbol">)</span><span class="pas1-space">
</span><span class="pas1-comment">//https://www.w3schools.com/python/python_ref_functions.asp
</span><span class="pas1-space"> writeln</span><span class="pas1-symbol">(</span><span class="pas1-string">'is instance: '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'isinstance(decimal.Decimal,'</span><span class="pas1-symbol">+
</span><span class="pas1-space"> </span><span class="pas1-string">'(float, int, str, list, dict, tuple, type))'</span><span class="pas1-symbol">));</span><span class="pas1-space">
writeln</span><span class="pas1-symbol">(</span><span class="pas1-string">'is type: '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'type(str(decimal.Decimal(0.1)))'</span><span class="pas1-symbol">));
</span><span class="pas1-space"> writeln</span><span class="pas1-symbol">(</span><span class="pas1-string">'is type: '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'type(float(decimal.Decimal(0.1)))'</span><span class="pas1-symbol">));
</span><span class="pas1-space"> writeln</span><span class="pas1-symbol">(</span><span class="pas1-string">'is type: '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'type(decimal.Decimal)'</span><span class="pas1-symbol">));</span><span class="pas1-space">
writeln</span><span class="pas1-symbol">(</span><span class="pas1-string">'is type: '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'type(decimal)'</span><span class="pas1-symbol">));</span><span class="pas1-space">
</span><span class="pas1-comment">//eng.ExecString('from spacy import *');
</span><span class="pas1-space"> </span><span class="pas1-comment">//eng.ExecString('from nltk.classify import MaxentClassifier')
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">ExecString</span><span class="pas1-symbol">(</span><span class="pas1-string">'print("2*4")'</span><span class="pas1-symbol">);</span><span class="pas1-space">
</span><span class="pas1-comment">//1. Checking Memory Usage of Any Object
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">Execstring</span><span class="pas1-symbol">(</span><span class="pas1-string">'import sys'</span><span class="pas1-symbol">);
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">Execstring</span><span class="pas1-symbol">(</span><span class="pas1-string">'dic = {"a": 3, "b": 2, "c": 1, "d": 1}'</span><span class="pas1-symbol">);</span><span class="pas1-space">
println</span><span class="pas1-symbol">(</span><span class="pas1-string">'tip1: '</span><span class="pas1-symbol">+</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'sys.getsizeof(dic)'</span><span class="pas1-symbol">));
</span><span class="pas1-space">
</span><span class="pas1-comment">//2. Use of Map Function
</span><span class="pas1-space"> println</span><span class="pas1-symbol">(</span><span class="pas1-string">'tip2: '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'list(map(int,("12345678").split()))'</span><span class="pas1-symbol">));
</span><span class="pas1-space">
</span><span class="pas1-comment">//3. Sort List of Tuples by Any Index of Tuple Value
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">Execstring</span><span class="pas1-symbol">(</span><span class="pas1-string">'val=[("first",3,9),("second",4,6),("third",2,3)]'</span><span class="pas1-symbol">);
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">Execstring</span><span class="pas1-symbol">(</span><span class="pas1-string">'val.sort(key=lambda x: x[2],reverse=False)'</span><span class="pas1-symbol">);
</span><span class="pas1-space"> println</span><span class="pas1-symbol">(</span><span class="pas1-string">'tip3: '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'val'</span><span class="pas1-symbol">));
</span><span class="pas1-space">
</span><span class="pas1-comment">//4. Wise Use of Python Dictionary Comprehension
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">Execstring</span><span class="pas1-symbol">(</span><span class="pas1-string">'dic= [(str(i)+" element", i*2) for i in range(5)]'</span><span class="pas1-symbol">);</span><span class="pas1-space">
println</span><span class="pas1-symbol">(</span><span class="pas1-string">'tip4: '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'dict(dic)'</span><span class="pas1-symbol">));</span><span class="pas1-space">
</span><span class="pas1-comment">//5. Magical Use of Filter Function
</span><span class="pas1-space"> println</span><span class="pas1-symbol">(</span><span class="pas1-string">'tip5: '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'list(filter(lambda x: x%2, range(15)))'</span><span class="pas1-symbol">));
</span><span class="pas1-space">
</span><span class="pas1-comment">//6. Get Your Permutated Strings
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">Execstring</span><span class="pas1-symbol">(</span><span class="pas1-string">'import itertools'</span><span class="pas1-symbol">);
</span><span class="pas1-space"> println</span><span class="pas1-symbol">(</span><span class="pas1-string">'tip6: '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'list(itertools.permutations("MAX",3))'</span><span class="pas1-symbol">));
</span><span class="pas1-space">
</span><span class="pas1-comment">//7. Convert Your List Into a Single String
</span><span class="pas1-space"> println</span><span class="pas1-symbol">(</span><span class="pas1-string">'tip7: '</span><span class="pas1-symbol">+
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'" ".join(["This", "is", "a", "list" ,"elements."])'</span><span class="pas1-symbol">));
</span><span class="pas1-space">
</span><span class="pas1-comment">//8. Check for Anagrams
</span><span class="pas1-space"> pystrings</span><span class="pas1-symbol">:=</span><span class="pas1-space"> TStringlist</span><span class="pas1-symbol">.</span><span class="pas1-identifier">create</span><span class="pas1-symbol">;
</span><span class="pas1-space"> pystrings</span><span class="pas1-symbol">.</span><span class="pas1-identifier">add</span><span class="pas1-symbol">(</span><span class="pas1-string">'def is_anagram(str1, str2):'</span><span class="pas1-symbol">)
</span><span class="pas1-space"> pystrings</span><span class="pas1-symbol">.</span><span class="pas1-identifier">add</span><span class="pas1-symbol">(</span><span class="pas1-string">' return sorted(str1) == sorted(str2)'</span><span class="pas1-symbol">)
</span><span class="pas1-space"> </span><span class="pas1-comment">//eng.EvalStringsAsStr(pystrings);
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">ExecStrings4</span><span class="pas1-symbol">(</span><span class="pas1-identifier">pystrings</span><span class="pas1-symbol">);
</span><span class="pas1-space"> print</span><span class="pas1-symbol">(</span><span class="pas1-string">'tip8: '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'is_anagram("HAPPY", "NoSAD")'</span><span class="pas1-symbol">));
</span><span class="pas1-space"> print</span><span class="pas1-symbol">(</span><span class="pas1-string">' tip8: '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'is_anagram("ANAGRAM", "RAGMANA")'</span><span class="pas1-symbol">));
</span><span class="pas1-space"> </span><span class="pas1-comment">//pystrings.add('is_anagram('HAPPY', 'NoSAD'))')
</span><span class="pas1-space"> pystrings</span><span class="pas1-symbol">.</span><span class="pas1-identifier">free</span><span class="pas1-symbol">;
</span><span class="pas1-space">
</span><span class="pas1-comment">//9. Perfect Use of Comparison Operators
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">Execstring</span><span class="pas1-symbol">(</span><span class="pas1-string">'n=16'</span><span class="pas1-symbol">);
</span><span class="pas1-space"> println</span><span class="pas1-symbol">(</span><span class="pas1-string">'tip9: '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">EvalStr</span><span class="pas1-symbol">(</span><span class="pas1-string">'15 < n < 20'</span><span class="pas1-symbol">));
</span><span class="pas1-space">
</span><span class="pas1-comment">//10. Check for Time Complexity
</span><span class="pas1-space"> OpenWeb</span><span class="pas1-symbol">(</span><span class="pas1-string">'https://wiki.python.org/moin/TimeComplexity'</span><span class="pas1-symbol">)
</span><span class="pas1-space">
pyval</span><span class="pas1-symbol">:=</span><span class="pas1-space"> VarPythonEval</span><span class="pas1-symbol">(</span><span class="pas1-string">'sum([x for x in range(201)])'</span><span class="pas1-symbol">);
</span><span class="pas1-space"> </span><span class="pas1-comment">//writeln('evalvar '+botostr(VarIsPythonList(pyval)));
</span><span class="pas1-space"> writeln</span><span class="pas1-symbol">(</span><span class="pas1-string">'evalvar '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">botostr</span><span class="pas1-symbol">(</span><span class="pas1-identifier">VarIsnumeric</span><span class="pas1-symbol">(</span><span class="pas1-identifier">pyval</span><span class="pas1-symbol">)));
</span><span class="pas1-space"> pyval</span><span class="pas1-symbol">:=</span><span class="pas1-space"> NewPythonDict</span><span class="pas1-symbol">;
</span><span class="pas1-space"> writeln</span><span class="pas1-symbol">(</span><span class="pas1-identifier">botostr</span><span class="pas1-symbol">(</span><span class="pas1-identifier">VarIsPython</span><span class="pas1-symbol">(</span><span class="pas1-space"> pyval</span><span class="pas1-symbol">)));
</span><span class="pas1-space"> pyval </span><span class="pas1-symbol">:=</span><span class="pas1-space"> </span><span class="pas1-symbol">(</span><span class="pas1-identifier">VarPythonEval</span><span class="pas1-symbol">(</span><span class="pas1-string">'2 ** 3'</span><span class="pas1-symbol">));</span><span class="pas1-space">
</span><span class="pas1-comment">{ eng.ExecString('import subprocess');
eng.ExecString('subprocess.call(["pip", "install", "langdetect"])')
eng.ExecString('from langdetect import detect');
println('lang detect: '+eng.EvalStr('detect("bonjour mes ordinateurs")'));
}
</span><span class="pas1-space"> Out1</span><span class="pas1-symbol">.</span><span class="pas1-identifier">output</span><span class="pas1-symbol">:=</span><span class="pas1-space"> pyMemo</span><span class="pas1-symbol">;</span><span class="pas1-space">
pymemo</span><span class="pas1-symbol">.</span><span class="pas1-identifier">update</span><span class="pas1-symbol">;
</span><span class="pas1-space"> </span><span class="pas1-reservedword">end
</span><span class="pas1-space"> </span><span class="pas1-reservedword">else</span><span class="pas1-space"> writeln</span><span class="pas1-symbol">(</span><span class="pas1-string">'invalid library handle! '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">Getlasterrortext</span><span class="pas1-symbol">);
</span><span class="pas1-space"> println</span><span class="pas1-symbol">(</span><span class="pas1-string">'PythonOK: '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">botostr</span><span class="pas1-symbol">(</span><span class="pas1-identifier">PythonOK</span><span class="pas1-symbol">));</span><span class="pas1-space">
</span><span class="pas1-reservedword">except
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">raiseError</span><span class="pas1-symbol">;
</span><span class="pas1-space"> writeln</span><span class="pas1-symbol">(</span><span class="pas1-string">'PyErr '</span><span class="pas1-symbol">+</span><span class="pas1-identifier">ExceptionToString</span><span class="pas1-symbol">(</span><span class="pas1-identifier">ExceptionType</span><span class="pas1-symbol">,</span><span class="pas1-space"> ExceptionParam</span><span class="pas1-symbol">));
</span><span class="pas1-space"> </span><span class="pas1-comment">//PyErr Exception: Access violation at address 50F49DA6 in module '_multiarray_umath.cp37-win32.pyd'. Write of address 00000022.
</span><span class="pas1-space"> </span><span class="pas1-reservedword">finally
</span><span class="pas1-space"> </span><span class="pas1-comment">//eng.close
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">unloaddll</span><span class="pas1-symbol">;</span><span class="pas1-space">
</span><span class="pas1-comment">//PyFinalize();
</span><span class="pas1-space"> eng</span><span class="pas1-symbol">.</span><span class="pas1-identifier">free</span><span class="pas1-symbol">;
</span><span class="pas1-space"> </span><span class="pas1-comment">//PyFinalize();
</span><span class="pas1-space"> </span><span class="pas1-reservedword">end</span><span class="pas1-symbol">;</span><span class="pas1-space">
out1</span><span class="pas1-symbol">.</span><span class="pas1-identifier">free</span><span class="pas1-symbol">;
</span><span class="pas1-space"> </span><span class="pas1-comment">//pyImport(PyModule);
</span><span class="pas1-reservedword">end</span><span class="pas1-symbol">;
</span><span class="pas1-reservedword">begin</span><span class="pas1-space"> </span><span class="pas1-comment">//@main
</span><span class="pas1-space"> </span><span class="pas1-comment">//PythonEngine1.Free;
</span><span class="pas1-space"> </span><span class="pas1-comment">//myloadscript2:= filetostring(PYSCRIPT2);
</span><span class="pas1-space">
PyForm</span><span class="pas1-symbol">:=</span><span class="pas1-space"> loadForm2</span><span class="pas1-symbol">(300,200,</span><span class="pas1-space"> clgreen</span><span class="pas1-symbol">,</span><span class="pas1-string">'PyFrm4D'</span><span class="pas1-symbol">);
</span><span class="pas1-space"> pyMemo</span><span class="pas1-symbol">:=</span><span class="pas1-space"> TMemo</span><span class="pas1-symbol">.</span><span class="pas1-identifier">create</span><span class="pas1-symbol">(</span><span class="pas1-identifier">PyForm</span><span class="pas1-symbol">);
</span><span class="pas1-space"> pyMemo</span><span class="pas1-symbol">.</span><span class="pas1-identifier">parent</span><span class="pas1-symbol">:=</span><span class="pas1-space"> PyForm
PyForm</span><span class="pas1-symbol">.</span><span class="pas1-identifier">show</span><span class="pas1-symbol">;
</span><span class="pas1-space">
PYLaz_P4D_Demo2</span><span class="pas1-symbol">;</span><span class="pas1-space">
</span><span class="pas1-comment">//register_PYthonGUI;
</span><span class="pas1-reservedword">End</span><span class="pas1-symbol">.
----</span><span class="pas1-identifier">app_template_loaded_code</span><span class="pas1-symbol">----
----</span><span class="pas1-reservedword">File</span><span class="pas1-space"> newtemplate</span><span class="pas1-symbol">.</span><span class="pas1-identifier">txt </span><span class="pas1-reservedword">not</span><span class="pas1-space"> exists </span><span class="pas1-symbol">-</span><span class="pas1-space"> now saved</span><span class="pas1-symbol">!----
</span><span class="pas1-reservedword">doc</span><span class="pas1-symbol">:</span><span class="pas1-space"> https</span><span class="pas1-symbol">:</span><span class="pas1-comment">//stackoverflow.com/questions/23134820/unhandled-exception-at-multiarray-pyd-the-2nd-time-the-program-runs#23173191
</span><span class="pas1-identifier">https</span><span class="pas1-symbol">:</span><span class="pas1-comment">//stackoverflow.com/questions/16779799/py-initialize-and-py-finalize-and-matplotlib
</span><span class="pas1-reservedword">Doc</span><span class="pas1-symbol">:</span><span class="pas1-space"> Destroying </span><span class="pas1-reservedword">it</span><span class="pas1-space"> calls Py_Finalize</span><span class="pas1-symbol">,</span><span class="pas1-space"> which frees all memory allocated by the Python DLL</span><span class="pas1-symbol">.
</span><span class="pas1-reservedword">Or</span><span class="pas1-symbol">,</span><span class="pas1-space"> </span><span class="pas1-reservedword">if</span><span class="pas1-space"> you</span><span class="pas1-string">'re just using the Python API without the VCL wrappers, you can probably just call Py_NewInterpreter on your TPythonInterface object to get a fresh execution environment without necessarily discarding everything done before.
</span><span class="pas1-identifier">Evil eval</span><span class="pas1-symbol">()
</span><span class="pas1-identifier">You should never pass untrusted source </span><span class="pas1-reservedword">to</span><span class="pas1-space"> the eval</span><span class="pas1-symbol">()</span><span class="pas1-space"> directly</span><span class="pas1-symbol">.</span><span class="pas1-space"> </span><span class="pas1-reservedword">As</span><span class="pas1-space"> </span><span class="pas1-reservedword">it</span><span class="pas1-space"> </span><span class="pas1-reservedword">is</span><span class="pas1-space"> quite easy </span><span class="pas1-reservedword">for</span><span class="pas1-space"> the malicious user </span><span class="pas1-reservedword">to</span><span class="pas1-space"> wreak havoc </span><span class="pas1-reservedword">on</span><span class="pas1-space"> your system</span><span class="pas1-symbol">.</span><span class="pas1-space"> </span><span class="pas1-reservedword">For</span><span class="pas1-space"> example</span><span class="pas1-symbol">,</span><span class="pas1-space"> the following code can be used </span><span class="pas1-reservedword">to</span><span class="pas1-space"> delete all the files from the system</span><span class="pas1-symbol">.
1</span><span class="pas1-space"> </span><span class="pas1-symbol">>>>
2</span><span class="pas1-space"> eval</span><span class="pas1-symbol">(</span><span class="pas1-string">'os.system("RM -RF /")'</span><span class="pas1-symbol">)</span><span class="pas1-space"> </span><span class="pas1-character">#</span><span class="pas1-space"> command </span><span class="pas1-reservedword">is</span><span class="pas1-space"> deliberately capitalized
</span><span class="pas1-number">3</span><span class="pas1-space"> </span><span class="pas1-symbol">>>>
</span><span class="pas1-reservedword">Ref</span><span class="pas1-symbol">:</span><span class="pas1-space"> https</span><span class="pas1-symbol">:</span><span class="pas1-comment">//sourceforge.net/projects/maxbox/files/Examples/EKON/P4D/python37.dll/download
</span><span class="pas1-symbol">--------------------------------------------------------
</span><span class="pas1-identifier">dll </span><span class="pas1-reservedword">EXCEPT</span><span class="pas1-space"> Exception</span><span class="pas1-symbol">:</span><span class="pas1-space"> There </span><span class="pas1-reservedword">is</span><span class="pas1-space"> already one instance </span><span class="pas1-reservedword">of</span><span class="pas1-space"> TPythonEngine running</span><span class="pas1-symbol">.
</span><span class="pas1-identifier">TRUE
Exception</span><span class="pas1-symbol">:</span><span class="pas1-space"> Python </span><span class="pas1-reservedword">is</span><span class="pas1-space"> </span><span class="pas1-reservedword">not</span><span class="pas1-space"> properly initialized</span><span class="pas1-symbol">.
</span><span class="pas1-identifier">PascalScript maXbox4 </span><span class="pas1-symbol">-</span><span class="pas1-space"> RemObjects </span><span class="pas1-symbol">&</span><span class="pas1-space"> SynEdit
dll </span><span class="pas1-reservedword">EXCEPT</span><span class="pas1-space"> Exception</span><span class="pas1-symbol">:</span><span class="pas1-space"> There </span><span class="pas1-reservedword">is</span><span class="pas1-space"> already one instance </span><span class="pas1-reservedword">of</span><span class="pas1-space"> TPythonEngine running</span><span class="pas1-symbol">.
</span><span class="pas1-identifier">TRUE
Exception</span><span class="pas1-symbol">:</span><span class="pas1-space"> Python </span><span class="pas1-reservedword">is</span><span class="pas1-space"> </span><span class="pas1-reservedword">not</span><span class="pas1-space"> properly initialized</span><span class="pas1-symbol">.
</span><span class="pas1-identifier">dll </span><span class="pas1-reservedword">EXCEPT</span><span class="pas1-space"> Exception</span><span class="pas1-symbol">:</span><span class="pas1-space"> Access violation at address </span><span class="pas1-number">00345</span><span class="pas1-identifier">A76 </span><span class="pas1-reservedword">in</span><span class="pas1-space"> module </span><span class="pas1-string">'maXbox4.exe'</span><span class="pas1-symbol">.</span><span class="pas1-space"> Read </span><span class="pas1-reservedword">of</span><span class="pas1-space"> address </span><span class="pas1-float">4365636E.
</span><span class="pas1-identifier">TRUE
Exception</span><span class="pas1-symbol">:</span><span class="pas1-space"> Access violation at address </span><span class="pas1-number">6</span><span class="pas1-identifier">BA3BA66 </span><span class="pas1-reservedword">in</span><span class="pas1-space"> module </span><span class="pas1-string">'python36.dll'</span><span class="pas1-symbol">.</span><span class="pas1-space"> Read </span><span class="pas1-reservedword">of</span><span class="pas1-space"> address </span><span class="pas1-number">000000</span><span class="pas1-identifier">AD</span><span class="pas1-symbol">.
</span><span class="pas1-identifier">mapdll </span><span class="pas1-reservedword">EXCEPT</span><span class="pas1-space"> Exception</span><span class="pas1-symbol">:</span><span class="pas1-space"> There </span><span class="pas1-reservedword">is</span><span class="pas1-space"> already one instance </span><span class="pas1-reservedword">of</span><span class="pas1-space"> TPythonEngine running</span><span class="pas1-symbol">.
</span><span class="pas1-identifier">PythonOK TRUE
ImportEXCEPT Exception</span><span class="pas1-symbol">:</span><span class="pas1-space"> Access violation at address </span><span class="pas1-number">6</span><span class="pas1-identifier">BA3BA66 </span><span class="pas1-reservedword">in</span><span class="pas1-space"> module </span><span class="pas1-string">'python36.dll'</span><span class="pas1-symbol">.</span><span class="pas1-space"> Read </span><span class="pas1-reservedword">of</span><span class="pas1-space"> address </span><span class="pas1-number">000000</span><span class="pas1-identifier">AC</span><span class="pas1-symbol">.
</span><span class="pas1-space"> mX4 executed</span><span class="pas1-symbol">:</span><span class="pas1-space"> </span><span class="pas1-number">26/07/2021</span><span class="pas1-space"> </span><span class="pas1-number">13:30:51</span><span class="pas1-space"> Runtime</span><span class="pas1-symbol">:</span><span class="pas1-space"> </span><span class="pas1-number">0:0:</span><span class="pas1-float">2.48</span><span class="pas1-space"> Memload</span><span class="pas1-symbol">:</span><span class="pas1-space"> </span><span class="pas1-number">71%</span><span class="pas1-space"> use
Example </span><span class="pas1-number">3:</span><span class="pas1-space"> Python multithreading
All the programs above </span><span class="pas1-reservedword">in</span><span class="pas1-space"> this article are single</span><span class="pas1-symbol">-</span><span class="pas1-identifier">threaded programs</span><span class="pas1-symbol">.</span><span class="pas1-space"> Here</span><span class="pas1-string">'s an example of a multithreaded Python program.
</span><span class="pas1-identifier">import threading
</span><span class="pas1-reservedword">def</span><span class="pas1-space"> print_hello_three_times</span><span class="pas1-symbol">():
</span><span class="pas1-space"> </span><span class="pas1-reservedword">for</span><span class="pas1-space"> i </span><span class="pas1-reservedword">in</span><span class="pas1-space"> range</span><span class="pas1-symbol">(3):
</span><span class="pas1-space"> print</span><span class="pas1-symbol">("</span><span class="pas1-identifier">Hello</span><span class="pas1-symbol">")
</span><span class="pas1-space">
</span><span class="pas1-reservedword">def</span><span class="pas1-space"> print_hi_three_times</span><span class="pas1-symbol">():</span><span class="pas1-space">
</span><span class="pas1-reservedword">for</span><span class="pas1-space"> i </span><span class="pas1-reservedword">in</span><span class="pas1-space"> range</span><span class="pas1-symbol">(3):</span><span class="pas1-space">
print</span><span class="pas1-symbol">("</span><span class="pas1-identifier">Hi</span><span class="pas1-symbol">")</span><span class="pas1-space">
t1 </span><span class="pas1-symbol">=</span><span class="pas1-space"> threading</span><span class="pas1-symbol">.</span><span class="pas1-identifier">Thread</span><span class="pas1-symbol">(</span><span class="pas1-identifier">target</span><span class="pas1-symbol">=</span><span class="pas1-identifier">print_hello_three_times</span><span class="pas1-symbol">)</span><span class="pas1-space">
t2 </span><span class="pas1-symbol">=</span><span class="pas1-space"> threading</span><span class="pas1-symbol">.</span><span class="pas1-identifier">Thread</span><span class="pas1-symbol">(</span><span class="pas1-identifier">target</span><span class="pas1-symbol">=</span><span class="pas1-identifier">print_hi_three_times</span><span class="pas1-symbol">)</span><span class="pas1-space">
t1</span><span class="pas1-symbol">.</span><span class="pas1-identifier">start</span><span class="pas1-symbol">()
</span><span class="pas1-identifier">t2</span><span class="pas1-symbol">.</span><span class="pas1-identifier">start</span><span class="pas1-symbol">()
</span><span class="pas1-identifier">This </span><span class="pas1-reservedword">package</span><span class="pas1-space"> implements JSON support </span><span class="pas1-reservedword">for</span><span class="pas1-space"> FPC</span><span class="pas1-symbol">.
</span><span class="pas1-identifier">You might want </span><span class="pas1-reservedword">to</span><span class="pas1-space"> have a look at the lazarus jsonviewer tool</span><span class="pas1-symbol">,</span><span class="pas1-space"> written </span><span class="pas1-reservedword">using
</span><span class="pas1-identifier">fpJSON </span><span class="pas1-symbol">(</span><span class="pas1-identifier">see lazarus</span><span class="pas1-symbol">/</span><span class="pas1-identifier">tools</span><span class="pas1-symbol">/</span><span class="pas1-identifier">jsonviewer</span><span class="pas1-symbol">).</span><span class="pas1-space"> </span><span class="pas1-reservedword">It</span><span class="pas1-space"> visualizes the fpJSON data </span><span class="pas1-reservedword">and
</span><span class="pas1-identifier">shows how </span><span class="pas1-reservedword">to</span><span class="pas1-space"> </span><span class="pas1-reservedword">program</span><span class="pas1-space"> </span><span class="pas1-reservedword">using</span><span class="pas1-space"> fpjson</span><span class="pas1-symbol">.
</span><span class="pas1-identifier">JSON support consists </span><span class="pas1-reservedword">of</span><span class="pas1-space"> </span><span class="pas1-number">3</span><span class="pas1-space"> parts</span><span class="pas1-symbol">:
</span><span class="pas1-reservedword">unit</span><span class="pas1-space"> fpJSON </span><span class="pas1-reservedword">contains</span><span class="pas1-space"> the data representation</span><span class="pas1-symbol">.</span><span class="pas1-space"> Basically</span><span class="pas1-symbol">,</span><span class="pas1-space"> </span><span class="pas1-reservedword">it</span><span class="pas1-space"> defines a </span><span class="pas1-reservedword">set</span><span class="pas1-space"> </span><span class="pas1-reservedword">of
</span><span class="pas1-identifier">classes</span><span class="pas1-symbol">:
</span><span class="pas1-identifier">TJSONData
</span><span class="pas1-symbol">+-</span><span class="pas1-space"> TJSONNumber
</span><span class="pas1-symbol">+-</span><span class="pas1-space"> TJSONIntegerNumber
</span><span class="pas1-symbol">+-</span><span class="pas1-space"> TJSONFloatNumber
</span><span class="pas1-symbol">+-</span><span class="pas1-space"> TJSONInt64Number
</span><span class="pas1-symbol">+-</span><span class="pas1-space"> TJSONString
</span><span class="pas1-symbol">+-</span><span class="pas1-space"> TJSONBoolean
</span><span class="pas1-symbol">+-</span><span class="pas1-space"> TJSONNull
</span><span class="pas1-symbol">+-</span><span class="pas1-space"> TJSONObject
</span><span class="pas1-symbol">+-</span><span class="pas1-space"> TJSONArray
The TJSONData</span><span class="pas1-symbol">.</span><span class="pas1-identifier">JSONType </span><span class="pas1-reservedword">property</span><span class="pas1-space"> </span><span class="pas1-reservedword">is</span><span class="pas1-space"> an enumerated</span><span class="pas1-symbol">:
</span><span class="pas1-identifier">TJSONtype </span><span class="pas1-symbol">=</span><span class="pas1-space"> </span><span class="pas1-symbol">(</span><span class="pas1-identifier">jtUnknown</span><span class="pas1-symbol">,</span><span class="pas1-space"> jtNumber</span><span class="pas1-symbol">,</span><span class="pas1-space"> jtString</span><span class="pas1-symbol">,</span><span class="pas1-space"> jtBoolean</span><span class="pas1-symbol">,</span><span class="pas1-space"> jtNull</span><span class="pas1-symbol">,</span><span class="pas1-space"> jtArray</span><span class="pas1-symbol">,</span><span class="pas1-space"> jtObject</span><span class="pas1-symbol">);
</span><span class="pas1-identifier">Which allows </span><span class="pas1-reservedword">to</span><span class="pas1-space"> determine the </span><span class="pas1-reservedword">type</span><span class="pas1-space"> </span><span class="pas1-reservedword">of</span><span class="pas1-space"> a value</span><span class="pas1-symbol">.
</span><span class="pas1-space">
</span></code></pre><!--EndFragment--></body>
</html>