python - 在python中添加两个不同长度的列表，从右边开始

Question

我想从右边开始添加两个不同长度的列表这是一个例子

[3, 0, 2, 1]
[8, 7]

预期结果:

[3, 0, 10, 8]

这些列表表示多项式的系数

这是我的实现

class Polynomial:
    def __init__(self, coefficients):
        self.coeffs = coefficients

    def coeff(self, i):
        return self.coeffs[-(i+1)]

    def add(self, other):
        p1 = len(self.coeffs)
        p2 = len(other.coeffs)
        diff = abs(p1 - p2)
        if p1 > p2:
            newV = [sum(i) for i in zip(self.coeffs, [0]*diff+other.coeffs)]
        else:
            newV = [sum(i) for i in zip([0]*diff+self.coeffs, other.coeffs)]                  
        return Polynomial(newV)

    def __add__(self, other):
        return self.add(other).coeffs

这个工作正常，只是想知道如何做得更好、更干净的代码？由于 python 总是强调干净的代码，我想知道有什么方法可以编写更干净的 pythonic 代码？

Answer 1

编辑(2020-18-03):

>>> P = [3, 0, 2, 1]
>>> Q = [8, 7]
>>> from itertools import zip_longest
>>> [x+y for x,y in zip_longest(reversed(P), reversed(Q), fillvalue=0)][::-1]
[3, 0, 10, 8]

显然，如果您选择系数以相反方式排序的约定，您可以只使用

P = [1, 2, 0, 3]
Q = [7, 8]
[x+y for x,y in zip_longest(P, Q, fillvalue=0)]