"Test the relative speed of iteration coding alternatives." from timer2_runner import runner # <=== repslist = list(range(10_000)) def forLoop(): res = [] for x in repslist: res.append(abs(x)) return res def listComp(): return [abs(x) for x in repslist] def mapCall(): return list(map(abs, repslist)) # Use list() to force resuts def genExpr(): return list(abs(x) for x in repslist) # Use list() to force results def genFunc(): def gen(): for x in repslist: yield abs(x) return list(gen()) # Use list() to force results runner(forLoop, listComp, mapCall, genExpr, genFunc)