Ops, the code posted is not quite right (it's in the middle of a rewrite
:)). Use the following
def inner_iter(L, R):
if len(L) == 1:
for i in R:
yield i * L[0]
else:
el = L[0]
for rest in inner_iter(L[1:], R):
for i in R:
yield rest + i * el
def free_mod_iter(module):
R = module.base_ring()
L = module.gens()
return inner_iter(L, R)
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