python3 pip安装MarkupSafe==1.0失败解决过程

无法安装MarkupSafe

Collecting MarkupSafe==1.0
  Downloading MarkupSafe-1.0.tar.gz (14 kB)
 ERROR: Command errored out with exit status 1:
   command: /opt/py3/bin/python3.6 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-10jh3ic4/MarkupSafe/setup.py'"'"'; __file__='"'"'/tmp/pip-install-10jh3ic4/MarkupSafe/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-install-10jh3ic4/MarkupSafe/pip-egg-info
       cwd: /tmp/pip-install-10jh3ic4/MarkupSafe/
Complete output (5 lines):
Traceback (most recent call last):
   File "", line 1, in 
   File "/tmp/pip-install-10jh3ic4/MarkupSafe/setup.py", line 6, in 
     from setuptools import setup, Extension, Feature
ImportError: cannot import name 'Feature'
----------------------------------------
ERROR: Command errored out with exit status 1: python setup.py egg_info Check the logs for full command output.

对比之前成功的记录发现是setuptool版本的问题，python3源中的setuptools已经升级到47以上。

(py3) [root@500cf2fd4b0c opt]# pip list|grep setuptools
setuptools                45.2.0

把脚本从原来的

pip install --upgrade pip setuptools

修改为

pip install --upgrade pip setuptools==45.2.0