使用pip命令可能遇到的报错

1、使用pip安装包失败，报错：

Could not fetch URL https://pypi.python.org/simple/mitmproxy/: There was a problem confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:645) - skipping

  Could not find a version that satisfies the requirement mitmproxy (from versions: )

No matching distribution found for mitmproxy

可以通过国内镜像安装：pip install 包名-i http://pypi.douban.com/simple/ --trusted-host pypi.douban.com

--trusted-host pypi.douban.com 这是为了获得ssl证书的认证

 

2、使用pip安装包失败，报错 error: Microsoft Visual C++ 14.0 is required. Get it with "Microsoft Visual C++ Build Tools": https://visualstudio.microsoft.com/downloads/

------需要安装Microsoft Visual C++ Build Tools 2015

 

3、python3.7版本，pip版本太老，pip升级命令：

pip3 install --upgrade pip --trusted-host pypi.org --trusted-host files.pythonhosted.org

 

4、使用pip install XX出现错误consider using the '--user' option or check the permissions

纠正方法：pip install --user XX