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_regex_bad_pattern():
    """Regex error raised immediately when regex input parser is created."""
    assert_raises(re.error, inputs.regex, '[')