def snake_to_camel_case(input_str: str, use_pascal: bool = False) -> str: """ Transforms a snake_case given string to camelCase (or PascalCase if indicated) (defaults to not use Pascal) >>> snake_to_camel_case("some_random_string") 'someRandomString' >>> snake_to_camel_case("some_random_string", use_pascal=True) 'SomeRandomString' >>> snake_to_camel_case("some_random_string_with_numbers_123") 'someRandomStringWithNumbers123' >>> snake_to_camel_case("some_random_string_with_numbers_123", use_pascal=True) 'SomeRandomStringWithNumbers123' >>> snake_to_camel_case(123) Traceback (most recent call last): ... ValueError: Expected string as input, found <class 'int'> >>> snake_to_camel_case("some_string", use_pascal="True") Traceback (most recent call last): ... ValueError: Expected boolean as use_pascal parameter, found <class 'str'> """ if not isinstance(input_str, str): msg = f"Expected string as input, found {type(input_str)}" raise ValueError(msg) if not isinstance(use_pascal, bool): msg = f"Expected boolean as use_pascal parameter, found {type(use_pascal)}" raise ValueError(msg) words = input_str.split("_") start_index = 0 if use_pascal else 1 words_to_capitalize = words[start_index:] capitalized_words = [word[0].upper() + word[1:] for word in words_to_capitalize] initial_word = "" if use_pascal else words[0] return "".join([initial_word, *capitalized_words]) if __name__ == "__main__": from doctest import testmod testmod()