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..