python loops

Author: AimenYaseen

python_for_coding_interviews/3_loops.py

@@ -0,0 +1,37 @@
+"""
+Python have two loops, while and for loop.
+
+While loop is used when you don't know about the number of iterations.
+Example, you have to take input from user repeatedly until it enters correct input.
+
+For loop is used when you know about the number of iterations.
+Example, print a number 10 times.
+
+"""
+
+n = 5
+while n < 5:
+    print(n)
+    n += 1
+
+"""
+We use range function for iteration in for loop.
+Some facts about range function:
+1. By default, it starts with 0.
+2. range(stop_value) equals to i < stop_value. It means last digit is always exclusive.
+3. You can also specify the starting value like this => range(start, stop).
+4. By default, it increments by +1.
+5. You can also specify the incrementing value like this => range(start, stop, increment).
+"""
+
+# Looping from i = 0 to i = 4
+for i in range(5):
+    print(i)
+
+# Looping from i = 2 to i = 5
+for i in range(2, 6):
+    print(i)
+
+# Looping from i = 5 to i = 2 with -1 increment
+for i in range(5, 1, -1):
+    print(i)