Supplying 2 arguments to 3-argument function

[valtih]

I have the following piece of code

		def visit(self, path, rootf, extraf): 
			return extraf(path, path.parent().visit(rootf, extraf))

I wonder how can it work if function visit takes 3 parameters but recursive call supplies only two.

[nilamo]

The first parameter is self, which is auto-populated with the current instance.

[valtih]

The first parameter is self, which is auto-populated with the current instance.

I obviously understand this when count only 3 arguments out of total 4: self, path, rootf and extraf. I see that recursion supplies only last two but not path. Can you explain that?

[nilamo]

Maybe the parent is a different class, that only expects two parameters?

Otherwise, it wouldn't run, since there's no default values.