iframe-proxy | Sunbelt Computer Software

History

60 lines (42 loc) · 1.61 KB

Raw

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()

Sunbelt Computer Software

PL/B Language Development and Support

Navigation Menu

Sunbelt Computer Software

PL/B Language Development and Support

FilesExpand file tree

camel_case_to_snake_case.py

Latest commit

History

camel_case_to_snake_case.py

File metadata and controls