How to fix "ERROR: {exc}" after pip3 update?

Question

pip

After updating pip, an error crashes and it cannot be launched even to view the version.
Already manually deleted and updated.
What was done:
1) removed pip, pip3, pip3.5 /usr/local/bin/
2) removed pip folder, pip-21dest.info /usr/local/lib/python3.5/dist-packages
3) removed python3 -pip ( sudo apt remove python3-pip)
Installed again, same errors.
sudo apt install python3-pip
Updated like this:
1) sudo -H pip3 install --upgrade pip
2) python3 -m pip install --upgrade pip

Also deleted from /home/webik/.local/...; even if the installation in /usr/bin still fails...
Tell me where to dig?

Answer 1

I had a similar problem due to confusion with python versions.
When working through venv, the env/bin/pip script was installed in the virtual environment, in which #!/env/bin/python3.6 was written, while venv installed only env/lib/python3.5, because there was a version problem python (needed 3.6, but defaulted to 3.5).
Helped:
- install the version of python3 I need from ppa (3.6.13 for example)
- switch the version of python3 using update-alternatives to 3.6
- install python3.6-venv, now venv will install python3.6 in any environment