Why does ansible-test pylint consider "_" to be a "bad-name"?

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Question about ansible-test sanity pylint - https://github.com/ansible/ansible/blob/stable-2.9/test/lib/ansible_test/_data/sanity/pylint/config/ansible-test.cfg#L28 - why is _ considered a bad variable name? It is the standard, or at least de facto, way to ignore one of the return values from a function?

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Hi,

Question about ansible-test sanity pylint -
https://github.com/ansible/ansible/blob/stable-2.9/test/lib/ansible_test/_data/sanity/pylint/config/ansible-test.cfg#L28
- why is _ considered a bad variable name? It is the standard, or at
least de facto, way to ignore one of the return values from a
function?

according to the documentation:
https://docs.ansible.com/ansible/latest/dev_guide/testing/sanity/no-underscore-variable.html

Cheers,
Felix