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master
strings/camel_case_to_snake_case.py
60 строк
2 KB
Marek Mazij
camelCase to snake_case conversion - Fixes #9726 (#9727)
06 окт 2023, 01:05
Не верифицирован
06 окт 2023, 01:05
7f94a73
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def camel_to_snake_case(input_str: str) -> str: """ Transforms a camelCase (or PascalCase) string to snake_case >>> camel_to_snake_case("someRandomString") 'some_random_string' >>> camel_to_snake_case("SomeRandomStr#ng") 'some_random_str_ng' >>> camel_to_snake_case("123someRandom123String123") '123_some_random_123_string_123' >>> camel_to_snake_case("123SomeRandom123String123") '123_some_random_123_string_123' >>> camel_to_snake_case(123) Traceback (most recent call last): ... ValueError: Expected string as input, found <class 'int'> """ # check for invalid input type if not isinstance(input_str, str): msg = f"Expected string as input, found {type(input_str)}" raise ValueError(msg) snake_str = "" for index, char in enumerate(input_str): if char.isupper(): snake_str += "_" + char.lower() # if char is lowercase but proceeded by a digit: elif input_str[index - 1].isdigit() and char.islower(): snake_str += "_" + char # if char is a digit proceeded by a letter: elif input_str[index - 1].isalpha() and char.isnumeric(): snake_str += "_" + char.lower() # if char is not alphanumeric: elif not char.isalnum(): snake_str += "_" else: snake_str += char # remove leading underscore if snake_str[0] == "_": snake_str = snake_str[1:] return snake_str if __name__ == "__main__": from doctest import testmod testmod()