Update comments in check_pangram.py script

strings/is_pangram.py

@@ -0,0 +1,95 @@
+"""
+wiki: https://en.wikipedia.org/wiki/Pangram
+"""
+
+
+def is_pangram(
+    input_str: str = "The quick brown fox jumps over the lazy dog",
+) -> bool:
+    """
+    A Pangram String contains all the alphabets at least once.
+    >>> is_pangram("The quick brown fox jumps over the lazy dog")
+    True
+    >>> is_pangram("Waltz, bad nymph, for quick jigs vex.")
+    True
+    >>> is_pangram("Jived fox nymph grabs quick waltz.")
+    True
+    >>> is_pangram("My name is Unknown")
+    False
+    >>> is_pangram("The quick brown fox jumps over the la_y dog")
+    False
+    >>> is_pangram()
+    True
+    """
+    # Declare frequency as a set to have unique occurrences of letters
+    frequency = set()
+
+    # Replace all the whitespace in our sentence
+    input_str = input_str.replace(" ", "")
+    for alpha in input_str:
+        if "a" <= alpha.lower() <= "z":
+            frequency.add(alpha.lower())
+    return len(frequency) == 26
+
+
+def is_pangram_faster(
+    input_str: str = "The quick brown fox jumps over the lazy dog",
+) -> bool:
+    """
+    >>> is_pangram_faster("The quick brown fox jumps over the lazy dog")
+    True
+    >>> is_pangram_faster("Waltz, bad nymph, for quick jigs vex.")
+    True
+    >>> is_pangram_faster("Jived fox nymph grabs quick waltz.")
+    True
+    >>> is_pangram_faster("The quick brown fox jumps over the la_y dog")
+    False
+    >>> is_pangram_faster()
+    True
+    """
+    flag = [False] * 26
+    for char in input_str:
+        if char.islower():
+            flag[ord(char) - 97] = True
+        elif char.isupper():
+            flag[ord(char) - 65] = True
+    return all(flag)
+
+
+def is_pangram_fastest(
+    input_str: str = "The quick brown fox jumps over the lazy dog",
+) -> bool:
+    """
+    >>> is_pangram_fastest("The quick brown fox jumps over the lazy dog")
+    True
+    >>> is_pangram_fastest("Waltz, bad nymph, for quick jigs vex.")
+    True
+    >>> is_pangram_fastest("Jived fox nymph grabs quick waltz.")
+    True
+    >>> is_pangram_fastest("The quick brown fox jumps over the la_y dog")
+    False
+    >>> is_pangram_fastest()
+    True
+    """
+    return len({char for char in input_str.lower() if char.isalpha()}) == 26
+
+
+def benchmark() -> None:
+    """
+    Benchmark code comparing different version.
+    """
+    from timeit import timeit
+
+    setup = "from __main__ import is_pangram, is_pangram_faster, is_pangram_fastest"
+    print(timeit("is_pangram()", setup=setup))
+    print(timeit("is_pangram_faster()", setup=setup))
+    print(timeit("is_pangram_fastest()", setup=setup))
+    # 5.348480500048026, 2.6477354579837993, 1.8470395830227062
+    # 5.036091582966037, 2.644472333951853,  1.8869528750656173
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()
+    benchmark()