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 _load_from_data(self, data):
        self._replay_data = data
        self._verify_toplevel_json(self._replay_data)

        self._rpms = self._replay_data.get("rpms", [])
        self._assert_type(self._rpms, list, "rpms", "array")

        self._groups = self._replay_data.get("groups", [])
        self._assert_type(self._groups, list, "groups", "array")

        self._environments = self._replay_data.get("environments", [])
        self._assert_type(self._environments, list, "environments", "array")