mirror of
https://github.com/TheAlgorithms/Python.git
synced 2024-12-22 11:10:14 +00:00
4700297b3e
* Enable ruff RUF002 rule * Fix --------- Co-authored-by: Christian Clauss <cclauss@me.com>
79 lines
2.1 KiB
Python
79 lines
2.1 KiB
Python
"""https://en.wikipedia.org/wiki/Jaro%E2%80%93Winkler_distance"""
|
|
|
|
|
|
def jaro_winkler(str1: str, str2: str) -> float:
|
|
"""
|
|
Jaro-Winkler distance is a string metric measuring an edit distance between two
|
|
sequences.
|
|
Output value is between 0.0 and 1.0.
|
|
|
|
>>> jaro_winkler("martha", "marhta")
|
|
0.9611111111111111
|
|
>>> jaro_winkler("CRATE", "TRACE")
|
|
0.7333333333333334
|
|
>>> jaro_winkler("test", "dbdbdbdb")
|
|
0.0
|
|
>>> jaro_winkler("test", "test")
|
|
1.0
|
|
>>> jaro_winkler("hello world", "HeLLo W0rlD")
|
|
0.6363636363636364
|
|
>>> jaro_winkler("test", "")
|
|
0.0
|
|
>>> jaro_winkler("hello", "world")
|
|
0.4666666666666666
|
|
>>> jaro_winkler("hell**o", "*world")
|
|
0.4365079365079365
|
|
"""
|
|
|
|
def get_matched_characters(_str1: str, _str2: str) -> str:
|
|
matched = []
|
|
limit = min(len(_str1), len(_str2)) // 2
|
|
for i, char in enumerate(_str1):
|
|
left = int(max(0, i - limit))
|
|
right = int(min(i + limit + 1, len(_str2)))
|
|
if char in _str2[left:right]:
|
|
matched.append(char)
|
|
_str2 = f"{_str2[0:_str2.index(char)]} {_str2[_str2.index(char) + 1:]}"
|
|
|
|
return "".join(matched)
|
|
|
|
# matching characters
|
|
matching_1 = get_matched_characters(str1, str2)
|
|
matching_2 = get_matched_characters(str2, str1)
|
|
match_count = len(matching_1)
|
|
|
|
# transposition
|
|
transpositions = (
|
|
len([(c1, c2) for c1, c2 in zip(matching_1, matching_2) if c1 != c2]) // 2
|
|
)
|
|
|
|
if not match_count:
|
|
jaro = 0.0
|
|
else:
|
|
jaro = (
|
|
1
|
|
/ 3
|
|
* (
|
|
match_count / len(str1)
|
|
+ match_count / len(str2)
|
|
+ (match_count - transpositions) / match_count
|
|
)
|
|
)
|
|
|
|
# common prefix up to 4 characters
|
|
prefix_len = 0
|
|
for c1, c2 in zip(str1[:4], str2[:4]):
|
|
if c1 == c2:
|
|
prefix_len += 1
|
|
else:
|
|
break
|
|
|
|
return jaro + 0.1 * prefix_len * (1 - jaro)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
import doctest
|
|
|
|
doctest.testmod()
|
|
print(jaro_winkler("hello", "world"))
|