Function twin_prime

maths/twin_prime.py:14–40

# doctest: +NORMALIZE_WHITESPACE This functions takes an integer number as input. returns n+2 if n and n+2 are prime numbers and -1 otherwise. >>> twin_prime(3) 5 >>> twin_prime(4) -1 >>> twin_prime(5) 7 >>> twin_prime(17) 19 >>> twin_prime(0) -1

(number: int)

def twin_prime(number: int) -> int:
    """
    # doctest: +NORMALIZE_WHITESPACE
    This functions takes an integer number as input.
    returns n+2 if n and n+2 are prime numbers and -1 otherwise.
    >>> twin_prime(3)
    5
    >>> twin_prime(4)
    -1
    >>> twin_prime(5)
    7
    >>> twin_prime(17)
    19
    >>> twin_prime(0)
    -1
    >>> twin_prime(6.0)
    Traceback (most recent call last):
        ...
    TypeError: Input value of [number=6.0] must be an integer
    """
    if not isinstance(number, int):
        msg = f"Input value of [number={number}] must be an integer"
        raise TypeError(msg)
    if is_prime(number) and is_prime(number + 2):
        return number + 2
    else:
        return -1


if __name__ == "__main__":