python3.x中pip升级报错

python3.x中使用pip安装包 在使用pip进行安装python扩展包时，可能遇到警告或安装失败，提示语句为： You are using pip version 8.1.1, however version 9.0.1 is available. You should consider upgrading via the ‘python -m pip install –upgrade pi

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