test_posixpath.py 文件源码

def test_expanduser(self):
        self.assertEqual(posixpath.expanduser("foo"), "foo")
        self.assertEqual(posixpath.expanduser(b"foo"), b"foo")
        try:
            import pwd
        except ImportError:
            pass
        else:
            self.assertIsInstance(posixpath.expanduser("~/"), str)
            self.assertIsInstance(posixpath.expanduser(b"~/"), bytes)
            # if home directory == root directory, this test makes no sense
            if posixpath.expanduser("~") != '/':
                self.assertEqual(
                    posixpath.expanduser("~") + "/",
                    posixpath.expanduser("~/")
                )
                self.assertEqual(
                    posixpath.expanduser(b"~") + b"/",
                    posixpath.expanduser(b"~/")
                )
            self.assertIsInstance(posixpath.expanduser("~root/"), str)
            self.assertIsInstance(posixpath.expanduser("~foo/"), str)
            self.assertIsInstance(posixpath.expanduser(b"~root/"), bytes)
            self.assertIsInstance(posixpath.expanduser(b"~foo/"), bytes)

            with support.EnvironmentVarGuard() as env:
                env['HOME'] = '/'
                self.assertEqual(posixpath.expanduser("~"), "/")
                self.assertEqual(posixpath.expanduser("~/foo"), "/foo")
                # expanduser should fall back to using the password database
                del env['HOME']
                home = pwd.getpwuid(os.getuid()).pw_dir
                # $HOME can end with a trailing /, so strip it (see #17809)
                self.assertEqual(posixpath.expanduser("~"), home.rstrip("/"))