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

近期練習flask寫個blog， 安裝flask擴展時 pip install Flask-WTF 報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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