A导出依赖

pip freeze >requirements.txt

B导入安装依赖

pip install -r requirements.txt

使用下面的命令安装依赖能自动跳过安装错误的依赖包，继续安装！

while read requirements; do pip install $requirements; done < requirements.txt

pip导出项目依赖包名称及版本，再安装命令