Python - Timeit within a class

I'm having some real trouble with timing a function from within an instance of a class. I'm not sure I'm going about it the right way (never used timeIt before) and I tried a few variations of the second argument importing things, but no luck. Here's a silly example of what I'm doing:

import timeit

class TimedClass():
    def __init__(self):
        self.x = 13
        self.y = 15
        t = timeit.Timer("self.square(self.x, self.y)")
        try:
            t.timeit()
        except:
            t.print_exc()

    def square(self, _x, _y):
        print _x**_y

myTimedClass = TimedClass()

Which, when ran, complains about self.

Traceback (most recent call last):
  File "timeItTest.py", line 9, in __init__
    t.timeit()
  File "C:\Python26\lib\timeit.py", line 193, in timeit
    timing = self.inner(it, self.timer)
  File "<timeit-src>", line 6, in inner
    self.square(self.x, self.y)
NameError: global name 'self' is not defined

This has to do with TimeIt creating a little virtual environment to run the function in but what do I have to pass to the second argument to make it all happy?

if you're willing to consider alternatives to timeit, i recently found the stopwatch timer utility which might be useful in your case. it's really simple and intuitive, too:

import stopwatch

class TimedClass():

    def __init__(self):
        t = stopwatch.Timer()
        # do stuff here
        t.stop()
        print t.elapsed