Python实现DNA序列互补、反向、反向互补

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def complement(sequence):
    sequence = sequence.upper()
    sequence = sequence.replace('A', 't')
    sequence = sequence.replace('T', 'a')
    sequence = sequence.replace('C', 'g')
    sequence = sequence.replace('G', 'c')
    return sequence.upper()

def reverse(sequence):
    sequence = sequence.upper()
    return sequence[::-1]

def complement_reverse(sequence):
    return complement(reverse(sequence))