pywikibot includes a lot of deprecation methods and parameters to support old code. The deprecation messages are logged using the normal python logging system, but are not routed through warnings.DeprecationWarning, which allows command line control over whether they are displayed (and defaults to not being displayed)
https://docs.python.org/2/library/warnings.html#warnings.warn
Version: core-(2.0)
Severity: major
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=71738