test_pkg_resources.py 文件源码

def env(self, tmpdir):
        """
        Create a package environment, similar to a virtualenv,
        in which packages are installed.
        """

        class Environment(str):
            pass

        env = Environment(tmpdir)
        tmpdir.chmod(stat.S_IRWXU)
        subs = 'home', 'lib', 'scripts', 'data', 'egg-base'
        env.paths = dict(
            (dirname, str(tmpdir / dirname))
            for dirname in subs
        )
        list(map(os.mkdir, env.paths.values()))
        return env