test_import.py 文件源码

def test_imp_module(self):
        # Verify that the imp module can correctly load and find .py files
        # XXX (ncoghlan): It would be nice to use support.CleanImport
        # here, but that breaks because the os module registers some
        # handlers in copy_reg on import. Since CleanImport doesn't
        # revert that registration, the module is left in a broken
        # state after reversion. Reinitialising the module contents
        # and just reverting os.environ to its previous state is an OK
        # workaround
        orig_path = os.path
        orig_getenv = os.getenv
        with EnvironmentVarGuard():
            x = imp.find_module("os")
            self.addCleanup(x[0].close)
            new_os = imp.load_module("os", *x)
            self.assertIs(os, new_os)
            self.assertIs(orig_path, new_os.path)
            self.assertIsNot(orig_getenv, new_os.getenv)