内置python2.7升级pip后不可用的解决办法

1.centos7内置python，安装pip yum install -y python-pip 后，在使用pip中有一些库安装会提示升级pip，但升级后，pip不可用了

2.解决方法1：卸载重装pip：yum remove -y python-pip && yum install -y python-pip

3.若方法1操作后任然不行，报错如下，此时删除/usr/lib/python2.7/site-packages/logging即可：mv /usr/lib/python2.7/site-packages/logging /usr/lib/python2.7/site-packages/logging.bak

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 升级后提示：ImportError: No module named typing

原因是：pip21和python2.7不配套，报错里面的typing库是python3.5才出现的，python2.7版本没有这个库。

解决办法：

1.yum remove -y python-pip && yum install -y python-pip
2.python -m pip install --upgrade "pip < 21.0"　　
3.pip install aliyun-python-sdk-cdn

 4.报错：sys.stderr.write(f"ERROR: {exc}")

[root@VM-0-7-centos:root script]# pip install aliyun-python-sdk-cdn
Traceback (most recent call last):
  File "/usr/bin/pip", line 9, in <module>
    load_entry_point('pip==21.0', 'console_scripts', 'pip')()
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 378, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2566, in load_entry_point
    return ep.load()
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2260, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/usr/lib/python2.7/site-packages/pip/_internal/cli/main.py", line 60
    sys.stderr.write(f"ERROR: {exc}")
                                   ^
SyntaxError: invalid syntax

解决：

使用get-pip.py安装pip

wget https://bootstrap.pypa.io/pip/2.7/get-pip.py
python2 get-pip.py