解决pycharm报错：module 'pip' has no attribute 'main'

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在使用pycharm安装matplotlib库的时候出现报错 module ‘pip’ has no attribute ‘main’，解决方法：

1.在安装目录下找到 helpers/packaging_tool.py文件。
2.找到函数do_install(pkgs)和do_uninstall(pkgs)
3.使用以下代码替换这两个函数：

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)

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参考资料：
1.https://blog.csdn.net/Teddy_123/article/details/80189306
2.https://segmentfault.com/q/1010000014743128