The repository located at pypi.mirrors.ustc.edu.cn is not a trus ted or secure host and is being ignored. If this repository is available via HTTPS we recommend you use HTTPS instead, otherwise you may silence t his warning and allow it anyway with '--trusted-host pypi.mirrors.ustc.ed u.cn'.

这个警告通常是因为 pip 发现您正在尝试从一个不受信任的源安装包。这个源可能是有问题的，或者可能是一个恶意源。为了保证您的安全，pip 会阻止您从这个源安装包。如果您确定这个源是可靠的，您可以使用 `--trusted-host` 参数来安装包，例如：

pip install --trusted-host pypi.mirrors.ustc.edu.cn package-name

这个参数会告诉 pip 信任这个源，允许您从这个源安装包。如果您不确定这个源是否可靠，建议您使用其他的源来安装包。

相关问题

WARNING: The repository 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'. ERROR: Could not find a version that satisfies the requirement django (from versions: none) ERROR: No matching distribution found for django WARNING: The repository 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'.

这个错误提示表明pip在尝试从pypi.douban.com下载django时出现了问题。首先，它建议您使用HTTPS代替HTTP来连接pypi.douban.com以提高安全性。如果您确定该源是可信的，您可以添加--trusted-host选项来允许pip连接该源。

另外，这个错误的主要原因是pip无法找到适合的版本下载。可能是因为您的pip版本过低或者您所在的环境中没有安装django的版本，您可以尝试升级pip或者检查是否安装了django的版本。可以使用以下命令来安装django：

pip install django

如果这个命令依然不起作用，您可以尝试切换pip源或者更新pip本身。

warning: the repository 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'.

警告：位于pypi.douban.com的存储库不是受信任或安全的主机，正在被忽略。如果此存储库通过https可用，我们建议您改用https，否则您可以使用“--trusted-host pypi.douban.com”静音此警告并仍然允许它。