PyCharm 2017.3 解决 pip 升级后无法安装第三方库问题
修改文件：packaging_tool.py
解决时分别出现了一下三种错误：
AttributeError: module 'pip' has no attribute 'main' 模块'pip'没有属性'main'
NameError: name 'pip' is not defined 名称'pip'未定义
TypeError: 'module' object is not callable “模块”对象不可调用，引入进来的 main 是个模块不能直接调用，需要 main.main()
修改后的方法
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
def do_install(pkgs):
try:
# import pip
try:
from pip._internal import main
except Exception:
from pip import main
except ImportError:
error_no_pip()
#return pip.main(['install'] + pkgs)
return main.main(['install'] + pkgs)
def do_uninstall(pkgs):
try:
#import pip
try:
from pip._internal import main
except Exception:
from pip import main
except ImportError:
error_no_pip()
#return pip.main(['uninstall', '-y'] + pkgs)
return main.main(['uninstall', '-y'] + pkgs)
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
