解决方法：输入：pip3 install –index–url https://pypi.douban.com/simple requests
出现：WARNING: You are using pip version 19.2.3, however version 20.1 is available.
You should consider upgrading via the ‘python –m pip install —upgrade pip‘ command.
再次输入：python –m pip install —upgrade pip –index–url https://pypi.douban.com/simple requests
成功安装
Installing collected packages: pip
Found existing installation: pip 19.2.3
Uninstalling pip-19.2.3:
Successfully uninstalled pip-19.2.3
Successfully installed pip-20.1
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原文链接：https://blog.csdn.net/FormZeroToOne/article/details/106174573
原文地址:https://blog.csdn.net/Lanran177/article/details/134409908
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