pycharm中pip安装不了包

pycharm安装不了包,安装或更新包时报下列错误:AttributeError: module ‘pip’ has no attribute ‘main’

打开pycharm安装路径,找到helpers文件夹下的packging_tool.py

打开packging_tool.py文件
找到do_install函数,将它改成如下所示

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

找到do_uninstall函数,将它改成如下所示

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