> sentinel = object() > ... > > def foo(x, y=sentinel): > if y is sentinel: > y = self.a
it just struck me you could also do:
def foo(self, x, *y_args)
y = y_args[0] if y_args self.a
which more directly checks whether an argument was passed, but has the
downside of making the method signature less clear in the declaration.
andrew
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