Sorry I posted a bit fast, my two example above should read:
class Foo:
def __init__(self, bar=42, baz=None):
self.bar = bar
self.baz = baz
#
def do_something(self, bar_override=None, baz_override=None)
...
And the second one:
class Missing:
pass
MISSING = Missing()
class Foo:
...
def do_something(self, bar_override=MISSING, baz_override=MISSING)
...
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