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Jul 6, 2022
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36 changes: 36 additions & 0 deletions strings/hamming_distance.py
Original file line number Diff line number Diff line change
@@ -0,0 +1,36 @@
def hamming_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
"""
assert len(string1) == len(string2)

count = 0

for char1, char2 in zip(string1, string2):
if char1 != char2:
count += 1

return count


if __name__ == "__main__":

import doctest

doctest.testmod()