unittest is another module with half-fixed and half-variable names.  The default (glob) pattern for test module names is given as "test*.py".  The fixed pattern for test methods is given as "starts with 'test'".  This could have been given, I believe, as re "test/w*", but it wasn't.  The former is clearer for more people.  So no guidance there.

I agree that we should follow the 2 precedents. Thank you both.