test_os.py 文件源码

def test_get_exec_path(self):
        defpath_list = os.defpath.split(os.pathsep)
        test_path = ['/monty', '/python', '', '/flying/circus']
        test_env = {'PATH': os.pathsep.join(test_path)}

        saved_environ = os.environ
        try:
            os.environ = dict(test_env)
            # Test that defaulting to os.environ works.
            self.assertSequenceEqual(test_path, os.get_exec_path())
            self.assertSequenceEqual(test_path, os.get_exec_path(env=None))
        finally:
            os.environ = saved_environ

        # No PATH environment variable
        self.assertSequenceEqual(defpath_list, os.get_exec_path({}))
        # Empty PATH environment variable
        self.assertSequenceEqual(('',), os.get_exec_path({'PATH':''}))
        # Supplied PATH environment variable
        self.assertSequenceEqual(test_path, os.get_exec_path(test_env))

        if os.supports_bytes_environ:
            # env cannot contain 'PATH' and b'PATH' keys
            try:
                # ignore BytesWarning warning
                with warnings.catch_warnings(record=True):
                    mixed_env = {'PATH': '1', b'PATH': b'2'}
            except BytesWarning:
                # mixed_env cannot be created with python -bb
                pass
            else:
                self.assertRaises(ValueError, os.get_exec_path, mixed_env)

            # bytes key and/or value
            self.assertSequenceEqual(os.get_exec_path({b'PATH': b'abc'}),
                ['abc'])
            self.assertSequenceEqual(os.get_exec_path({b'PATH': 'abc'}),
                ['abc'])
            self.assertSequenceEqual(os.get_exec_path({'PATH': b'abc'}),
                ['abc'])