TypeError: descriptor '__subclasses__' of 'type' object needs an argument while trying to import rasa_core

Question

尝试 运行 一个程序 运行 在我的本地机器上完全正常，但在 AWS 上我得到：TypeError: descriptor '__subclasses__' of 'type' object needs an argument。 我的 pip3 没有升级到最新版本，但这应该不会造成问题，因为我已经下载了最新版本的 rasa_core.

尝试使用 pip3 -u rasa_core 重新安装 rasa_core，还尝试使用 sudo 附加命令。 这是我得到的错误，有人可以帮忙

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/ubuntu/.local/lib/python3.5/site-packages/rasa_core/__init__.py", line 5, in <module>
    from rasa_core.train import train
  File "/home/ubuntu/.local/lib/python3.5/site-packages/rasa_core/train.py", line 11, in <module>
    from rasa_core.domain import TemplateDomain
  File "/home/ubuntu/.local/lib/python3.5/site-packages/rasa_core/domain.py", line 12, in <module>
    from rasa_core.actions import Action, action
  File "/home/ubuntu/.local/lib/python3.5/site-packages/rasa_core/actions/__init__.py", line 1, in <module>
    from rasa_core.actions.action import Action
  File "/home/ubuntu/.local/lib/python3.5/site-packages/rasa_core/actions/action.py", line 9, in <module>
    from rasa_core import events
  File "/home/ubuntu/.local/lib/python3.5/site-packages/rasa_core/events/__init__.py", line 73, in <module>
    class Event(object):
  File "/home/ubuntu/.local/lib/python3.5/site-packages/rasa_core/events/__init__.py", line 94, in Event
    default: Optional[Type['Event']] = None
  File "/usr/lib/python3.5/typing.py", line 649, in __getitem__
    return Union[arg, type(None)]
  File "/usr/lib/python3.5/typing.py", line 552, in __getitem__
    dict(self.__dict__), parameters, _root=True)
  File "/usr/lib/python3.5/typing.py", line 512, in __new__
    for t2 in all_params - {t1} if not isinstance(t2, TypeVar)):
  File "/usr/lib/python3.5/typing.py", line 512, in <genexpr>
    for t2 in all_params - {t1} if not isinstance(t2, TypeVar)):
  File "/usr/lib/python3.5/typing.py", line 1077, in __subclasscheck__
    if super().__subclasscheck__(cls):
  File "/usr/lib/python3.5/abc.py", line 225, in __subclasscheck__
    for scls in cls.__subclasses__():
TypeError: descriptor '__subclasses__' of 'type' object needs an argument

有人可以帮忙吗。

Answer 1

如果您的 python 3.5 是 3.5.3 或以下版本，我相信升级应该可以解决问题。查看相关问题 here

来自typing中的相关错误：

typing will only get upgraded with Python if you are on Python 3.5+. Since this issue was fixed in August 2016, I believe any 3.5 release above 3.5.3 should work.