python重载运算符

Question

我需要实现一个DNA类,它具有一个序列,该序列由字母表中的一串字符组成('A,C,G,T'),我需要重载一些小于,大于等的运算符.

这是我的代码:

class DNA:
    def __init__(self,sequence):
        self.seq=sequence

    def __lt__(self,other):
        return (self.seq<other)

    def __le__(self,other):
        return(self.seq<=other)

    def __gt__(self,other):
        return(self.seq>other)

    def __ge__(self,other):
        return(len(self.seq)>=len(other))

    def __eq__(self,other):
        return (len(self.seq)==len(other))

    def __ne__(self,other):
        return not(self.__eq__(self,other))

    dna_1=DNA('ACCGT')
    dna_2=DNA('AGT')
    print(dna_1>dna_2)

问题:

当print(dna_1>dna_2)它返回false而不是true...为什么？

Answer 1

你可能想要比较seqs:

def __lt__(self, other):
    return self.seq < other.seq

etc.

不是self的seq用other,self的seq用other的seq.

other 这是另一种DNA.

如果你需要比较长度:

def __lt__(self, other):
    return len(self.seq) < len(other.seq)

etc.