pip3安装报错AttributeError: module 'enum' has no attribute 'IntFlag'

问题综述

mac下使用pip3安装包的时候报错：

Traceback (most recent call last): File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line 544, in <module> main() File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line 530, in main known_paths = addusersitepackages(known_paths) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line 282, in addusersitepackages user_site = getusersitepackages() File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line 258, in getusersitepackages user_base = getuserbase() # this will also set USER_BASE File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line 248, in getuserbase USER_BASE = get_config_var('userbase') File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/sysconfig.py", line 601, in get_config_var return get_config_vars().get(name) File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/sysconfig.py", line 580, in get_config_vars import _osx_support File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/_osx_support.py", line 4, in <module> import re File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/re.py", line 142, in <module> class RegexFlag(enum.IntFlag): AttributeError: module 'enum' has no attribute 'IntFlag'

解决方案

在终端输入：

unset PYTHONPATH