seq = input('请输入您要处理的序列(仅包含ATGC):') demand = 'ATGC' for each in seq: if each not in demand: print('您输入的序列不符合要求') seq = input('请重新输入:') break seqreverse = seq[::-1] transtable = str.maketrans('ATGC','TACG') finalseq = seqreverse.translate(transtable) print('对应的反向互补序列是:',finalseq)

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