ERROR when in use pip to install some Python libraries

ERROR: case No matching distribution found for tensorflow of
this may be because of network problems, then we use domestic mirror source to accelerate
enter the command: python -m pip install requests (if you are installing other libraries, please do not enter the library name) -i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com
then you successfully installed.

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Origin www.cnblogs.com/zhaoyang110/p/11583705.html