TheAlgorithms-Python

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