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Message: [QUOTE="Paul Rubin, post: 3895408"] Didn't we just have a huge thread about that? Using a special null value is often (not always) a code smell. But anyway (untested): def compare(a,b): if a is None and b is None: # I'm guessing you meant this return "No data" if a == b: return "Stayed the same" if a != 0 else "Never had" elif a < b: return "gained" else: # we know here that a > b return "Lost some" if b > 0 else "Lost all" I don't know what you intended to do in the case where exactly one of (a,b) is None, so I'll leave that to you. [/QUOTE]