#simulate N rolls of a pair of standard dice
#and tabulate the number of times each roll occurs.

from pylab import *

def dice(N):
    d={} #Python dictionary
    for j in range(N):
        x=tuple(choice(arange(1,7),2)) #need tuples to index dictionaries
        if x in d:
            d[x]+=1
        else:
            d[x]=1
    for j in arange(1,7):
        for k in arange(1,7):
            y=(j,k)
            print(y,':',d[y])