Should Python raise a warning for mutable default arguments?

[bearophileHUGS at lycos.com]

DrScheme is an implementation of Scheme that is very newbie-friendly.
It has several limited sub-languages, etc.

So maybe a command line option can be added to Python3 ( -
newbie ? :-) ) that just switches on similar warnings, to help newbies
(in schools, where there's a teacher that encourages to always use
that command line option) avoid some of the most common traps.

Bye,
bearophile