ERROR: Could not find a version that satisfies the requirement setuptools (from versions: none)

ERROR: Could not find a version that satisfies the requirement setuptools (from versions: none) 这个错误提示是由于找不到满足要求的setuptools版本所引起的。

解决这个问题的一种方法是首先排除网络问题，＊＊＊ located at pypi.douban.com is not a trusted or secure host and is being ignored. If this repository is available via HTTPS we recommend you use HTTPS instead, otherwise you may silence this warning and allow it anyway with ‘--trusted-host pypi.douban.com’这个警告信息，说明你使用的pypi.douban.com镜像地址不被信任或不安全，可以尝试使用HTTPS来访问这个镜像地址，或者可以忽略这个警告并继续安装。

综上所述，解决ERROR: Could not find a version that satisfies the requirement setuptools＊＊＊<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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