Pypy is *fast*

birth_month.py

#!/usr/bin/env python
import random

matches = 0
total = 1000000
people = 5

for i in range(total):
    month = random.randrange(12)
    for j in reversed(range(people - 1)):
        if random.randrange(12) != month:
            break
        if j == 0:
            print('Everyone has the same birth month: %s' % month)
            matches += 1

print('%s/%s %s%%' % (matches, total, (100 * matches/float(total))))

speed

ggreer@boron:~% time python birth_month.py
...
python birth_month.py  7.99s user 0.04s system 98% cpu 8.186 total
ggreer@boron:~%
ggreer@boron:~% time python3 birth_month.py
...
python3 birth_month.py  11.91s user 0.02s system 99% cpu 11.943 total
ggreer@boron:~%
ggreer@boron:~% time ~/Downloads/pypy-2.4.0-linux64/bin/pypy birth_month.py
...
~/Downloads/pypy-2.4.0-linux64/bin/pypy birth_month.py  0.53s user 0.03s system 98% cpu 0.566 total
ggreer@boron:~%