a=[1,2,3,4].reverse() - why "a" is None?

[Xavier Ho]

Nadav, it's because reverse() modifies the list in-place. I've gotten this
gotcha many times,

If you had done:

>>> a = [1,2,3,4]
>>> a.reverse()
>>> a
[4, 3, 2, 1]

Or even better:

>>> a = [1,2,3,4][::-1]
>>> a
[4, 3, 2, 1]

Cheers,
Xav
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