安装Python包

四种为Python安装包的方法

 

常用格式： d:\python\python_3.8.2\python.exe -m pip install packagename -i http://pypi.douban.com/sample --trusted-host pypi.douban.com

 

可能会遇见错误：

 

ERROR: Could not find a version that satisfies the requirement packagename (from versions: none)
ERROR: No matching distribution found for packagename

解决措施：

d:\python\python_3.8.2\python.exe -m pip install --upgrade pip -i http://pypi.douban.com/sample --trusted-host pypi.douban.com