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Message: [QUOTE="Dave Angel, post: 5071022"] What version of Python? It'd be only polite if you actually included the traceback, instead of paraphrasing the error. let's examine the code that generates the syntax error. for i=list2 in list1: That doesn't match any of the grammar of Python, so it gives a syntax error. How could the compiler have interpreted it? Perhaps it could have thrown out the 'for' and the colon. That would be equivalent in this case to: i = False or we could toss out the "=list2" but that would give us your first loop. If I were doing this, I'd do something like (untested): temp = list1[:] #make a shallow copy of the list, so we're not modifying the original while temp print temp[:3] temp = temp[3:] I think you could do something similar with zip, but I don't have the energy this morning. [/QUOTE]