更新pip之后，Pycharm安装package出现报错：module 'pip' has no attribute 'main'
找到安装目录下 helpers/packaging_tool.py文件，找到如下代码：
修改为如下，保存即可。
def do_install(pkgs):
try:
# import pip
try:
from pip._internalimport main
except Exception:
from pipimport main
except ImportError:
error_no_pip()
return main(['install'] + pkgs)
def do_uninstall(pkgs):
try:
# import pip
try:
from pip._internalimport main
except Exception:
from pipimport main
except ImportError:
error_no_pip()
return main(['uninstall','-y'] + pkgs)
转自：https://www.cnblogs.com/jackadam/p/9055122.html
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