For our Python users, it’s really common for pip to install various software. You must encounter various upgrade errors. Make some records here for reference in the future

  AttributeError: ‘NoneType’ object has no attribute ‘bytes’

Normal PIP upgrade command:

python -m pip install –upgrade pip

There was no problem before, but I reported an error today

  AttributeError: ‘NoneType’ object has no attribute ‘bytes’

Effective solutions are:

easy_install -U pip