进行pip更新后报ERROR: Could not install packages due to an EnvironmentError:，然后使用pip时ModuleNotFoundError:

进行pip更新后报ERROR: Could not install packages due to an EnvironmentError:，然后使用pip时ModuleNotFoundError: No module named ‘pip’

解决方法：

python -m ensurepip
python -m pip install --upgrade pip