异常二_pip install 安装包异常失败&清华源403被禁止访问，只能换源

异常如下图

Defaulting to user installation because normal site-packages is not writeable
Looking in indexes: https://pypi.tuna.tsinghua.edu.cn/simple
Collecting bs4
  ERROR: HTTP error 403 while getting https://pypi.tuna.tsinghua.edu.cn/packages/51/bb/bf7aab772a159614954d84aa832c129624ba6c32faa559dfb200a534e50b/bs4-0.0.2-py2.py3-nonERROR: Could not install requirement bs4 from https://pypi.tuna.tsinghua.edu.cn/packages/51/bb/bf7aab772a159614954d84aa832c129624ba6c32faa559dfb200a534e50b/bs4-0.0.2-py2.py3-none-any.whl because of HTTP error 403 Client Error: Forbidden for url: https://pypi.tuna.tsinghua.edu.cn/packages/51/bb/bf7aab772a159614954d84aa832c129624ba6c32faa559dfb200a534e50b/bs4-0.0.2-py2.py3-none-any.whl for URL https://pypi.tuna.tsinghua.edu.cn/packages/51/bb/bf7aab772a159614954d84aa832c129624ba6c32faa559dfb200a534e50b/bs4-0.0.2-py2.py3-none-any.whl (from https://pypi.tuna.tsinghua.edu.cn/simple/bs4/)

然后查了一下，只能换源，换源的cmd命令如下。我们换阿里云的

pip config set global.index-url https://mirrors.aliyun.com/pypi/simple/

然后换了之后查看是否成功，查看当前源：

pip config list 

 其他源：（清华源和豆瓣源）

pip config  set global.extra-index-url"https://pypi.tuna.tsinghua.edu.cn/simple http://pypi.douban.com/simple"