"no module found" in python after installing module via pip

Question

运行 python 脚本（使用 python3）时，我一直看到错误No module named 'ruamel' ，即使在运行命令pip3 install ruamel.yaml

Answer 1

The issue was that the versions of pip and python were mismatched, so pip was installing the ruamel module onto python 3.8, but running python3 was using python 3.9

To diagnose the issue:

1. Check the python version being used with python3 --version
2. Check the pip version being used with pip3 --version

If the versions are different, you can call pip with the exact version number. For example, pip3.9 install ruamel.yaml to ensure that the module is installed onto the correct python version.