cannot import name 'Deque'?

[Xonxt]

Been using websockets on my PC for a while, no problems.

Had to briefly test something on another colleague's PC, told him to also install this package, but he's having a weird exception, just when trying to import websockets. Here's the trace:

>>> import websockets
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\%username%\AppData\Roaming\Python\Python36\site-packages\websockets\__init__.py", line 3, in <module>
    from .auth import *
  File "C:\Users\%username%\AppData\Roaming\Python\Python36\site-packages\websockets\auth.py", line 15, in <module>
    from .server import HTTPResponse, WebSocketServerProtocol
  File "C:\Users\%username%\AppData\Roaming\Python\Python36\site-packages\websockets\server.py", line 49, in <module>
    from .protocol import WebSocketCommonProtocol
  File "C:\Users\%username%\AppData\Roaming\Python\Python36\site-packages\websockets\protocol.py", line 18, in <module>
    from typing import (
ImportError: cannot import name 'Deque'

We're both using Python 3.6. I was using websockets 7.0 before, but the colleagues installed the newest 8.0.2. I then also updated to the newest version, yet I still have no problems, while the colleague does.

Any idea what that could be?

[aaugustin]

Perhaps this is the same issue as #664? If your colleague has Python 3.6.0 and you have 3.6.1 or later, that would explain the problem.