安装python库时报错“ERROR: Could not find a version that satisfies the requirement numpy (from versions: n”

问题:
安装python库时报错“:

ERROR: Could not find a version that satisfies the requirement numpy (from versions: none)
ERROR: No matching distribution found for numpy

解决办法:
使用如下命令:

pip install numpy -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com

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