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树莓派安装gunicon时遇到错误，求大神指导怎么解决

树莓派安装gunicon时遇到错误，求大神指导怎么解决 Traceback (most recent call last): File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 122, in main OSError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/dist-packages/gunicorn-19.7.1.dist-info'