on writing a while loop for rolling two dice

[Hope Rouselle]

How should I write this?  I'd like to roll two six-sided dice until I
get the same number on both.  I'd like to get the number of times I
tried.  Here's a primitive I'm using:

--8<---------------cut here---------------start------------->8---
>>> x, y = roll()
>>> x
6
>>> y
6 # lucky

>>> x, y = roll()
>>> x
4
>>> y
1 # unlucky
--8<---------------cut here---------------end--------------->8---

Here's my solution:

--8<---------------cut here---------------start------------->8---
def how_many_times():
  x, y = 0, 1
  c = 0
  while x != y:
    c = c + 1
    x, y = roll()
  return c, (x, y)
--8<---------------cut here---------------end--------------->8---

Why am I unhappy?  I'm wish I could confine x, y to the while loop.  The
introduction of ``x, y = 0, 1'' must feel like a trick to a novice.  How
would you write this?  Thank you!