removing a digit from a integer

[munchie]

i want to know how to remove a digit from an integer and place that digit at the beginning of the number. I know how to do it in a list but am not sure how to do in without creating a list.
eg.
digits(123)
>>>312

[bvdet]

This uses a str object, but not a list:

>>> i = 123
>>> s = str(i)
>>> int(s[-1]+s[:-1])
312
>>> 

This doesn't use any type of sequence:

i = 123456789
ii = i
j = 0
while ii:
    ii, k = divmod(ii, 10)
    j += 1
n, x = divmod(i, 10)
print x * 10**(j-1) + n