> Just a note: because Python sticks an implicit 'return None' at the end of > a function, rather than returning the result of the last expression, like > Scheme, you have to have an explicit return to see any effect: > > def traverse(t, f): > if t: > f(t) > traverse(t.left) > return traverse(t.right) Right. I actually worked that out for myself not too long ago, and then forgot it.
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