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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def check_header_validity(header):
 """Verifies that header value is a string which doesn't contain leading whitespace or return characters. This prevents unintended header injection. :param header: tuple, in the format (name, value). """

    name, value = header

    if isinstance(value, bytes):
        pat = _CLEAN_HEADER_REGEX_BYTE
    else:
        pat = _CLEAN_HEADER_REGEX_STR
    try:
        if not pat.match(value):
            raise InvalidHeader("Invalid return character or leading space in header: %s" % name)
    except TypeError:
        raise InvalidHeader("Value for header {%s: %s} must be of type str or "
                            "bytes, not %s" % (name, value, type(value)))