ERROR: Could not install packages due to an EnvironmentError: [Errno 13] Permission denied: '/Librar...

近期练习flask写个blog， 安装flask扩展时 pip install Flask-WTF 报ERROR: Could not install packages due to an EnvironmentError: [Errno 13] Permission denied: '/Library/Python/2.7/site-packages/itsdangerous' Consider

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