util.py 文件源码

def is_ipv4(value):
    """Utility function to detect if a value is a valid IPv4

        :param value: The value to match against.
        :return: True if the value is a valid IPv4.
    """
    try:
        socket.inet_pton(socket.AF_INET, value)
    except AttributeError:  # no inet_pton here, sorry
        try:
            socket.inet_aton(value)
        except socket.error:
            return False
        return value.count('.') == 3
    except socket.error:  # not a valid address
        return False
    return True