solver.py

#!/usr/bin/env python
'''
a solver for http://twitter.com/not522/status/16626276702
'''

from sys import argv
from itertools import permutations,product

ops = ['+','-','*','/']
parns = ['', '(', ')' ]
nums = map(float,argv[1:])

for n in permutations(nums):
  for o in product(ops, repeat = len(nums) -1):
    for p in product(parns, repeat = len(nums) * 2):
      e = ''
      for i in xrange(len(nums)-1):
        e += '%s %f %s %s ' % (p[i * 2], n[i], p[i * 2 - 1], o[i])
      e += '%s %f %s' % (p[-2], n[-1], p[-1])
      try:
        ans = eval(e)
        if 3.13 < ans < 3.15:
          print(e + ' = %0.2f' % ans)
      except:
        pass