Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
    typing.Type['']
    ~~~~~~~~~~~^^^^
  File "/Users/sobolev/Desktop/cpython2/Lib/typing.py", line 389, in inner
    return _caches[func](*args, **kwds)
           ~~~~~~~~~~~~~^^^^^^^^^^^^^^^
  File "/Users/sobolev/Desktop/cpython2/Lib/typing.py", line 1458, in __getitem__
    params = tuple(_type_check(p, msg) for p in params)
             ~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sobolev/Desktop/cpython2/Lib/typing.py", line 1458, in <genexpr>
    params = tuple(_type_check(p, msg) for p in params)
                   ~~~~~~~~~~~^^^^^^^^
  File "/Users/sobolev/Desktop/cpython2/Lib/typing.py", line 187, in _type_check
    arg = _type_convert(arg, module=module, allow_special_forms=allow_special_forms)
          ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sobolev/Desktop/cpython2/Lib/typing.py", line 165, in _type_convert
    return ForwardRef(arg, module=module, is_class=allow_special_forms)
           ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/sobolev/Desktop/cpython2/Lib/typing.py", line 890, in __init__
    raise SyntaxError(f"Forward reference must be an expression -- got {arg!r}")
SyntaxError: Forward reference must be an expression -- got ''