hamming_distance.py

defhamming_distance(string1: str, string2: str) ->int:
"""Calculate the Hamming distance between two equal length strings
 In information theory, the Hamming distance between two strings of equal
 length is the number of positions at which the corresponding symbols are
 different. https://en.wikipedia.org/wiki/Hamming_distance

 Args:
 string1 (str): Sequence 1
 string2 (str): Sequence 2

 Returns:
 int: Hamming distance

 >>> hamming_distance("python", "python")
 0
 >>> hamming_distance("karolin", "kathrin")
 3
 >>> hamming_distance("00000", "11111")
 5
 >>> hamming_distance("karolin", "kath")
 Traceback (most recent call last):
 ...
 ValueError: String lengths must match!
 """
iflen(string1) !=len(string2):
raiseValueError("String lengths must match!")

count=0

forchar1, char2inzip(string1, string2):
ifchar1!=char2:
count+=1

returncount


if__name__=="__main__":
importdoctest

doctest.testmod()