nth root

[Mensanator]

On Jan 31, 8:05 am, Mark Dickinson <dicki... at gmail.com> wrote:
> On Jan 31, 1:23 pm, Steve Holden <st... at holdenweb.com> wrote:
>
> > Much more significant points, given the limited precision of the doubles
> > Python will be using. Could gmpy do this better, I wonder?
>
> Almost certainly, if exact results are wanted!  At least, GMP has
> an mpz_root function; I don't know offhand whether gmpy makes it
> accessible from Python.
>
> Mark

What am I doing wrong here?

IDLE 2.6b1
>>> import timeit
>>> from gmpy import root
>>> root(4021503534212915433093809093996098953996019232,13)
(mpz(3221), 0)
>>> t1 = timeit.Timer("x = root(a,r)", "a = 4021503534212915433093809093996098953996019232; r = 13")
>>> t1.timeit()

Traceback (most recent call last):
  File "<pyshell#5>", line 1, in <module>
    t1.timeit()
  File "C:\Python26\lib\timeit.py", line 193, in timeit
    timing = self.inner(it, self.timer)
  File "<timeit-src>", line 6, in inner
NameError: global name 'root' is not defined