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return vs yield Generator can create data instantly without creating multiple data in advance. def return_abc(): return list("ABC") def yield_abc(): yield "A" yield "B" yield "C" >>> print(return_abc()) ['A', 'B', 'C'] >>> print(yield_abc()) yield vs yield from With yield from, it transformates list immediately. def yield_abc(): for ch in ["A", "B", "C"]: yield ch def yield_abc(): yield from ["A..

itertools.islice islice(iterable, start, stop, step) Iterate Slice, selectively prints the values mentioned in its iterable container passed as an argument. for i in islice(range(20),1,10,3): print(i) >>> 1 4 7 chain chain('ABC', 'DEF') --> A B C D E F from itertools import chain country=['korea','japan','usa'] capi=['seoul','tokyo','new'] c=chain(country,capi) next(c) >>> korea isinstance It re..