best.py

#!/usr/bin/env python

from __future__ import print_function, division

from math import pi

best = []
bestError = 1e6

for front in range(20, 55):
    for rear in range(10, 33):
        ratio = front / rear
        error = abs(pi - ratio)
        if error < bestError:
            bestError = error
            best = [(front, rear)]
        elif error == bestError:
            best.append((front, rear))

print('Best ratio%s:' % '' if len(best) == 1 else 's')
for front, rear in best:
    print('\tfront=%d rear=%d' % (front, rear))

print('Error:', bestError)