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 exists(self):
        collection = self.client.api.cm.shared.licensing.pools_s.get_collection(
            requests_params=dict(
                params="$filter=name+eq+'{0}'".format(self.want.name)
            )
        )
        if len(collection) == 1:
            return True
        elif len(collection) == 0:
            return False
        else:
            raise F5ModuleError(
                "Multiple license pools with the provided name were found!"
            )