pip阿里源 -i https://mirrors.aliyun.com/pypi/simple/

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pip install --upgrade pip 报如下错误：

attributeerror 'nonetype' object has no attribute 'bytes'

使用easy_in

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1. 下载文件 wget https://bootstrap.pypa.io/get-pip.py --no-check-certificate
2. 执行安装
   python

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