pip 升级报错AttributeError: module ‘types‘ has no attribute ‘resolve

pip 升级报错AttributeError: module ‘types‘ has no attribute ‘resolve

 尝试以下方式进行升级：

1、python -m pip install -U --force-reinstall pip

2、python -m pip install -U pip

3、easy_install -U pip

最后一句终于升级成功了，yyds