little problem with list.reverse() function

[manuel]

a = [[1,2],[2,3],[4,5]]

>>> print a [[1, 2], [2, 3], [4, 5]]
>>> print a.reverse() None
>>>

???
Thanks...

 

[Grant Edwards]

a = [[1,2],[2,3],[4,5]]
print a [[1, 2], [2, 3], [4, 5]]
print a.reverse() None

a = [[1,2],[2,3],[4,5]]
print a [[1, 2], [2, 3], [4, 5]]
a.reverse()
print a [[4, 5], [2, 3], [1, 2]]

 

[manuel]

oops....THANKS

 

[Roy Smith]

a = [[1,2],[2,3],[4,5]]
print a [[1, 2], [2, 3], [4, 5]]
print a.reverse() None

???
Thanks...[/QUOTE]

The reverse() method of lists reverses the list in-place, and returns
None on purpose. Almost everybody finds this surprising when they
discover it for the first time. Many people (myself included) consider
it a design flaw. But, it is an intentional design decision, not a bug.