linux 下python esay_install 出错

我运行easy_install命令显示：
File "build/bdist.linux-x86_64/egg/setuptools/pa│
ckage_index.py", line 475, in fetch_distribution │
AttributeError: 'NoneType' object has no attribute│
'clone'

何解啊...网上没找到攻略..

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升级 setuptools