ERROR: Invalid requirement: '.\\requirements.txt': Expected package name at the start of dependency specifier .\requirements.txt ^ Hint: It looks like a path. The path does exist. The argument you provided (.\requirements.txt) appears to be a requirements file. If that is the case, use the '-r' flag to install the packages specified within it.

在python中使用pip安装依赖时报错，如下图：

原因：安装命令错误。解决：加上 - r 即可。

正确安装命令：

pip install -r  .\requirements.txt