Striding slice?

[Bengt Richter]

 >>> a='0123456789'
 >>> a[0:5]
 '01234'
 >>> a[0:5:2]
 Traceback (most recent call last):
   File "<stdin>", line 1, in ?
 TypeError: sequence index must be integer
 >>>

How about (faked example):
 >>> a[0:5:2]
 '024'
?