pip出现升级提醒
You are using pip version 10.0.1, however version 21.1.2 is available.
You should consider upgrading via the 'python -m pip install --upgrade pip' command.
按照提醒命令行升级出现错误
python -m pip install --upgrade pip
错误提示：AttributeError: 'NoneType' object has no attribute 'bytes'
强制升级解决方案
>python -m pip install -U --force-reinstall pip
查看安装列表
pip list
lockdatav Done!
