typing‘ has no attribute ‘_ SpecialForm‘

python 3.6 + pytorch1.7.1/pytorch1.7.1
Problems arise ：
File “/home/spl/software/anaconda3/envs/handmesh/lib/python3.6/site-packages/typing_extensions.py”, line 159, in
class _FinalForm(typing._SpecialForm, _root=True):
AttributeError: module ‘typing’ has no attribute ‘_SpecialForm’

resolvent ：

Use python 3.8 And above + pytorch 1.7.1/ pytorch1.7.0
pip install typing-extensions==3.7.4.3 // Replace typing-extensions Version of a file
=== It is strongly not recommended that python 3.6 Add pytorch 1.7 I vomited. …
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One of my computers , It's also python3.6

conda uninstall pip

conda install pip 

Repeated several times , The final solution is .

in py3.8 edition , install openvino success .