[Tutor] new and freezing problem

[Jennifer Cianciolo]

Hi!

I'm new to this list.  I have no programming experience, but I'm
trying to teach myself some with python.

I've written a short program that keeps making my computer freeze. 
Actually it's not the whole computer, just python.  This is the
program:

def freqChange(p, N, w11, w12, w22):
    q=1-p
    pnew=(N*(p**2*w11+q*p*w12))/(N*(p**2*w11+2*p*q*w12+q**2*w22))
    while 0<=pnew<=1.0:
        p=pnew
        q=1-pnew
    print pnew


any ideas what might be wrong??  

thanks in advance
Jen