python2.7 pip 升级报错 python setup.py egg_info“ failed with error code 1

ubuntu16中python2.7 pip 升级报错 python setup.py egg_info" failed with error code 1

参考网址：

1. https://blog.youkuaiyun.com/Clovemeo/article/details/120191359
2. https://www.codeleading.com/19526119635/

原因：
版本升级跨度大，低级版本不能一下子升级到高版本
方法：
安装距离较近版本

python -m pip install --user --upgrade pip==20.2.4

如果还是不行 就手动安装

wget https://files.pythonhosted.org/packages/0b/f5/be8e741434a4bf4ce5dbc235aa28ed0666178ea8986ddc10d035023744e6/pip-20.2.4.tar.gz
tar -zxvf pip-20.2.4.tar.gz
cd pip-20.2.4
sudo python setup.py install
pip install -U pip #再次更新

参考这个https://me.jinchuang.org/archives/1158.html也可以

之后还会遇到以下问题可能：
ERROR: After October 2020 you may experience errors when installing or updating packages. This is because pip will change the way that it resolves dependency conflicts.。。。。。。。。。。

解决方案

在安装命令后加

--use-feature=2020-resolver

参考网址：https://blog.youkuaiyun.com/qq_41683065/article/details/108692509