[Tutor] cross product

[Julieta Rangel]

I've been playing with the cross product definition Daniel gave me. It makes 
a
lot of sense, and I'm sure it will make it a lot easier for me to prove
associativity; however, I'm doing something wrong because when I run it, I
don't get the result I thought I would.  Would you take a look and tell me
what I'm doing wrong?


def cross(set1,set2):
    resulting_set = []
    for s1 in set1:
        for s2 in set2:
            resulting_set.append( (s1, s2) )
            return resulting_set

set = ['e','a','b', 'ab']
print set

s = cross(set,cross(set,set))
print s


When I run it, I get the following:

['e', 'a', 'b', 'ab']
[('e', ('e', 'e'))]  #Shouldn't I get 64 pairs here instead of one?

I thought that a loop would do the trick, but I couldn't figure out how to
do it.  Can you help?  I want to get the entire 64 pairs on my printout.

Julieta


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