Mark Bryan Yu a écrit :
This set of codes works:
x = range(5)
x.reverse()
x
[4, 3, 2, 1, 0]
But this doesn't:
x = range(5).reverse()
print x
None
This works just as expected - at least for anyone having read the doc.
Please explain this behavior. range(5) returns a list from 0 to 4 and
reverse just reverses the items on the list that is returned by
range(5). Why is x None (null)?
Because that's what list.reverse() returns. Call it a wart if you want
(FWIW, I do), but at least that's well documented.
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