gistfile1.txt

#!/usr/bin/env python
from __future__ import division, generators, nested_scopes, print_function, with_statement
import os, readline, rlcompleter, atexit

readline.parse_and_bind("tab: complete")
readline.set_history_length(10000)

histfile = os.path.expanduser("~/.python/history")
try:
   readline.read_history_file(histfile)
except IOError:
   pass

def binomial(n,k):
   """return binominal coefficients for (n,k)"""
   return int(reduce(lambda a,b: a*(n-b)/(b+1),xrange(k),1))

atexit.register(readline.write_history_file, histfile)
del histfile, os