核酸序列的反向互补函数

def reverse_complement(s):
    complement_dna = {"A":"T", "T":"A", "C":"G", "G":"C", "a":"t", "t":"a", "c":"g", "g":"c", "N":"N", "n":"n" , ".":"."}
    reversed_s = []
    for i in s:
        reversed_s.append(complement_dna[i])
    reversed_s.reverse()
    return "".join(reversed_s)