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Consider this program
def foo(a,b):
	return min(zip(a,b)[2])
print foo(range(5), (0,9,-9))
With the default options, 2to3 rewrites this as
def foo(a,b):
	return min(zip(a,b)[2])
print(foo(list(range(5)), (0,9,-9)))
For some reason, 2to3 fails to wrap the call to zip in a list, even though the 2to3 documentation says that there is a fixer which does this. Obviously, the generated code will not work in Python 3 since you can't subscript an iterator.