在Windows系统下用pip安装时，PremissionError错误解决办法

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当用pip install package_name 语句直接安装时，出现如下报错：

C:\Users\wangz>pip install pygameCollecting pygame  Using cached pygame-1.9.3-cp36-cp36m-win_amd64.whlInstalling collected packages: pygameException:Traceback (most recent call last):  File "c:\program files\python36\lib\site-packages\pip\basecommand.py", line 215, in main    status = self.run(options, args)  File "c:\program files\python36\lib\site-packages\pip\commands\install.py", line 342, in run    prefix=options.prefix_path,  File "c:\program files\python36\lib\site-packages\pip\req\req_set.py", line 784, in install    **kwargs  File "c:\program files\python36\lib\site-packages\pip\req\req_install.py", line 851, in install    self.move_wheel_files(self.source_dir, root=root, prefix=prefix)  File "c:\program files\python36\lib\site-packages\pip\req\req_install.py", line 1064, in move_wheel_files    isolated=self.isolated,  File "c:\program files\python36\lib\site-packages\pip\wheel.py", line 345, in move_wheel_files    clobber(source, lib_dir, True)  File "c:\program files\python36\lib\site-packages\pip\wheel.py", line 316, in clobber    ensure_dir(destdir)  File "c:\program files\python36\lib\site-packages\pip\utils\__init__.py", line 83, in ensure_dir    os.makedirs(path)  File "c:\program files\python36\lib\os.py", line 220, in makedirs    mkdir(name, mode)PermissionError: [WinError 5] 拒绝访问。: 'c:\\program files\\python36\\Lib\\site-packages\\pygame'

此时应该采用 pip install --user package_name 语法进行安装：

C:\Users\wangz>pip install --user pygameCollecting pygame  Using cached pygame-1.9.3-cp36-cp36m-win_amd64.whlInstalling collected packages: pygameSuccessfully installed pygame-1.9.3

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