def coerce(cls, string):
        """Create a :class:`Requirement` object from a given package spec."""
        match = re.match(cls.spec_regex, string)
        if not match:
            raise InvalidRequirementSpecError("could not parse requirement")
        package = match.group(1)
        if all(match.group(2, 3)):
            version = "".join(match.group(2, 3))
        else:
            version = None
        return cls(package, version)
def _createSocket(self):
        try:
            sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
            self.sock = sock
            return 0
        except socket.error as e:
            sys.stderr.write("[!]\tFailed to create a UDP socket.\n%s.\n" % e)
            return 1