Resolve AttributeError: module 'typing' has no attribute '_SpecialForm'

Post installation local docker build of development branch, the videodeduplication container fails to start

Traceback (most recent call last):
  File "/anaconda/envs/winnow/bin/jupyter-notebook", line 7, in <module>
    from notebook.notebookapp import main
  File "/anaconda/envs/winnow/lib/python3.6/site-packages/notebook/notebookapp.py", line 60, in <module>
    from tornado import httpserver
  File "/anaconda/envs/winnow/lib/python3.6/site-packages/tornado/httpserver.py", line 32, in <module>
    from tornado.http1connection import HTTP1ServerConnection, HTTP1ConnectionParameters
  File "/anaconda/envs/winnow/lib/python3.6/site-packages/tornado/http1connection.py", line 32, in <module>
    from tornado import gen
  File "/anaconda/envs/winnow/lib/python3.6/site-packages/tornado/gen.py", line 94, in <module>
    import contextvars
  File "/anaconda/envs/winnow/lib/python3.6/site-packages/contextvars/_init_.py", line 4, in <module>
    import immutables
  File "/anaconda/envs/winnow/lib/python3.6/site-packages/immutables/_init_.py", line 18, in <module>
    from ._protocols import MapKeys as MapKeys
  File "/anaconda/envs/winnow/lib/python3.6/site-packages/immutables/_protocols.py", line 17, in <module>
    from typing_extensions import Protocol
  File "/anaconda/envs/winnow/lib/python3.6/site-packages/typing_extensions.py", line 159, in <module>
    class _FinalForm(typing._SpecialForm, _root=True):
AttributeError: module 'typing' has no attribute '_SpecialForm'

Hi, I also had this problem when running the code, did you solve it? Can you tell me how you solved this problem? Very grateful for your help

Fix typing icompatibility error (benetech#492)

Hi, I also had this problem when running the code, did you solve it? Can you tell me how you solved this problem? Very grateful for your help

Hi @13096676951x ! It was fixed by downgrading typing-extensions package from 4.2.0 to 4.1.1.

The root cause:

We use Python 3.6
typing-extensions 4.2.0 requires Python >= 3.7. (the previous version requires Python >= 3.6)
pip ignores the Python version requirements and happily installs incompatible packages.

Fix typing icompatibility error (#492)

Could you please tell me how to downgrade? I run pip install typing_extensions==4.1.1 directly in cmd and it prompts that I can't find the relevant version.Thank you very much!

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Resolve AttributeError: module 'typing' has no attribute '_SpecialForm' #492

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Resolve AttributeError: module 'typing' has no attribute '_SpecialForm' #492

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nonoXwb commented on Apr 21, 2022

stepan-anokhin commented on Apr 21, 2022

mufenglalala commented on May 15, 2022

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