Alessandro Cucci added the comment:
I don't think the problem is about the underscores, since this work...
class Foo:
def f1(self):
__obj = object()
def f2():
nonlocal __obj
__obj = []
f2()
return isinstance(__obj, list)
f = Foo()
print(f.f1())
----------
nosy: +acucci
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<http://bugs.python.org/issue25973>
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