> def cross_nodups(*args):
> 'Cross product after eliminating repeat elements, keeping constant
> size'
> ans = [[]]
> for arg in args:
> ans = [x+[y] for x in ans for y in arg if y not in x]
> return ans
>
> def choose_first(obj1, *args):
> 'Assume a choice of a first object'
> return cross_nodups(frozenset((obj1,)), *args[1:])
Oops, crap, I pasted the unchanged cross_nodups() you wrote. My
adjusted variety:
def cross_nodups(*args):
'Cross product after eliminating repeat elements, keeping constant
size'
ans = [[]]
for arg in args:
ans = [frozenset(list(x)+[y]) for x in ans for y in arg if y
not in x]
return set(ans)
Anyhow, thank you! :)
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