'Pytest tests' has failed

when I run tests with pytest, I’ve got some errors with ruamel.yaml package. if I use it as ‘ruamel.yaml’, python can’t import it, so I changed import ‘ruamel.yaml’ to ‘ruamel_yaml’ in core file, and the pytest reported errors, I don’t know how to solve it.

@pplantinga might know bout this.

I’ve never had problems installing or using ruamel.yaml but I found this thread that may help. Basically, the package also depends on libyaml being present:

I’m use “conda install ruamel.yaml” solve this problem.