def __init__(self, package, version):
        """Construct a new requirement.

        :param package: the package name.
        :param version: a semver compatible version specification.
        """
        self.package = package
        self.version = version
        if self.version and not re.match(r"[<=>~]", version[:2]):
            self.version = "=={}".format(self.version)
def test_can_encode_relationship_with_alternative_names(self):
        a = Node("Person", nom=u"Aimée")
        b = Node("Person", nom=u"Baptiste")
        ab = KNOWS_FR(a, b)
        encoded = cypher_repr(ab, related_node_template=u"{property.nom}")
        self.assertEqual(u"(Aimée)-[:CONNAÎT {}]->(Baptiste)", encoded)