Set warnings as errors.

Read more in Warnings in the Python docs.

Env variable appraoch

export PYTHONWARNINGS="error::DeprecationWarning"

CLI flag approach

Set -W error::DeprecationWarning

e.g.

pytest -s src/tests -W error::DeprecationWarning

python src/manage.py runserver 0.0.0.0:8000 -W error::DeprecationWarning

Ignore specific module/function:

-W error::DeprecationWarning \
-W "ignore:datetime.datetime.utcnow:DeprecationWarning"
-W "ignore::DeprecationWarning:requests.*"

Format:

action:message:category:module:line