[Tutor] Re: rotating a list

[Gregor Lingl]

Andrei schrieb:

> ... Could you explain why incrementing n is a superior solution? 

Superior or not?!

Here a definitely different solution:

 >>> def rotate(x):
        x[:-1],x[-1] = x[1:],x[0]

   
 >>> x = range(12)
 >>> print x, id(x)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11] 11554712
 >>> for i in range(12):
        rotate(x)
        print x

   
[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 0]
[2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 0, 1]
[3, 4, 5, 6, 7, 8, 9, 10, 11, 0, 1, 2]
[4, 5, 6, 7, 8, 9, 10, 11, 0, 1, 2, 3]
[5, 6, 7, 8, 9, 10, 11, 0, 1, 2, 3, 4]
[6, 7, 8, 9, 10, 11, 0, 1, 2, 3, 4, 5]
[7, 8, 9, 10, 11, 0, 1, 2, 3, 4, 5, 6]
[8, 9, 10, 11, 0, 1, 2, 3, 4, 5, 6, 7]
[9, 10, 11, 0, 1, 2, 3, 4, 5, 6, 7, 8]
[10, 11, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
[11, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]
 >>> print id(x)
11554712
 >>>

Of course, which one you use depends on
what you need

Regards,
Gregor