octal_to_binary.py

def octal_to_binary(octal: str) -> str:
    """
    Convert an octal value to its binary equivalent
    >>> octal_to_binary("")
    Traceback (most recent call last):
        ...
    ValueError: Empty string was passed to the function
    >>> octal_to_binary("-")
    Traceback (most recent call last):
        ...
    ValueError: Non-octal value was passed to the function
    >>> octal_to_binary("e")
    Traceback (most recent call last):
        ...
    ValueError: Non-octal value was passed to the function
    >>> octal_to_binary(8)
    Traceback (most recent call last):
        ...
    ValueError: Non-octal value was passed to the function
    >>> octal_to_binary("-e")
    Traceback (most recent call last):
        ...
    ValueError: Non-octal value was passed to the function
    >>> octal_to_binary("-8")
    Traceback (most recent call last):
        ...
    ValueError: Non-octal value was passed to the function
    >>> octal_to_binary("1")
    '0b1'
    >>> octal_to_binary("-1")
    '-0b1'
    >>> octal_to_binary("12")
    '0b1010'
    >>> octal_to_binary(" 12   ")
    '0b1010'
    >>> octal_to_binary("-45")
    '-0b100101'
    >>> octal_to_binary("-")
    Traceback (most recent call last):
        ...
    ValueError: Non-octal value was passed to the function
    >>> octal_to_binary("0")
    '0b0'
    >>> octal_to_binary("-4055")
    '-0b100000101101'
    >>> octal_to_binary("2-0Fm")
    Traceback (most recent call last):
        ...
    ValueError: Non-octal value was passed to the function
    >>> octal_to_binary("")
    Traceback (most recent call last):
        ...
    ValueError: Empty string was passed to the function
    >>> octal_to_binary("19")
    Traceback (most recent call last):
        ...
    ValueError: Non-octal value was passed to the function
    """
    oct_string = str(octal).strip()
    if not oct_string:
        raise ValueError("Empty string was passed to the function")
    is_negative = oct_string.startswith("-")
    if is_negative:
        oct_string = oct_string[1:]
        binary_num = "-0b"
    else:
        binary_num = "0b"
    if not oct_string.isdigit() or not all(0 <= int(char) <= 7 for char in oct_string):
        raise ValueError("Non-octal value was passed to the function")
    binary_num += str(bin(int(oct_string, 8)))[2:]
    return binary_num


if __name__ == "__main__":
    from doctest import testmod

    testmod()