def load_installed_version(self):
        installed_packages = get_installed_pypackages()
        if self.package in installed_packages:
            self.version = "=={}".format(
                installed_packages[self.package].version)
def test_equal_to():
    """Equal to y."""
    p = are.equal_to(1)
    ps = [p(x) for x in range(1, 6)]
    assert ps == [True, False, False, False, False]