解决pycharm第三方库的安装错误问题：module 'pip' has no attribute 'main'

转自:
《解决pycharm问题：module 'pip' has no attribute 'main'》
http://www.cnblogs.com/Fordestiny/p/8901100.html

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：
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def do_install(pkgs):
    try:
        import pip
    except ImportError:
        error_no_pip()
    return pip.main(['install'] + pkgs)


def do_uninstall(pkgs):
    try:
        import pip
    except ImportError:
        error_no_pip()
    return pip.main(['uninstall', '-y'] + pkgs)

修改为如下，保存即可。

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 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 main(['uninstall', '-y'] + pkgs)