Python安装依赖模块，指定国内源加上后报错： DEPRECATION: Failed to find 'certifi' at https://pypi.tuna.tsinghua.edu.cn/simple/certifi/. It is suggested to upgrade your index to support normalized names as the name in /simple/{name}. Cannot fetch index base URL https://pypi.tuna.tsinghua.edu.cn/simple/ Could not find a version that satisfies the requirement certifi==2017.11.5 (from -r requirements.txt (line 1)) (from versions: ) No matching distribution found for certifi==2017.11.5 (from -r requirements.txt (line 1))
翻译下来就是
：`在https://pypi.tuna.tsinghua.edu.cn/simple/certifi/上找不到“证书”。建议升级索引以支持标准化名称，如/simple/{name}中的名称。无法获取索引基础URL https://pypi.tuna.tsinghua.edu.cn/simple/
无法找到满足要求的版本certifi==2017.11.5 (from -r requirements.txt (line 1)) (from versions:)
没有找到certifi==2017.11.5的匹配分发(来自-r requirements.txt(第1行)`
解决方法：
在pip命令后面加上--trusted-host mirrors.aliyun.com，使用下面pip命令安装语句安装即可：
pip install xxx -i http://mirrors.aliyun.com/pypi/simple/ --trusted-host mirrors.aliyun.com
成功：
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