只能concatenate list(不是"Point") to list In adding and subtracting points in python

Question

我正在尝试执行以下任务：对于两个点 (1,1)+(2,2)=(1+2,1+2)

我执行了这段代码：

class Point(object):

    def __init__(self, x, y):
        self.x = x
        self.y = y
    
    def __repr__(self):
        return "Point({0}, {1})".format(self.x, self.y)
    
    def __add__(self, other):
        return [self.x + other.x, self.y + other.y]
    def __sub__(self, other):
        return [self.x - other.x, self.y - other.y]

当我尝试运行下面的代码时，它说：

from functools import reduce
def add_sub_results(points):
    points = [Point(*point) for point in points]
    return [str(reduce(lambda x, y: x + y, points)), 
            str(reduce(lambda x, y: x - y, points))]

它returns

 return [str(reduce(lambda x, y: x + y, points)), 
      5             str(reduce(lambda x, y: x - y, points))]
      6 

TypeError: can only concatenate list (not "Point") to list

我该如何解决这个问题？

Answer 1

我认为你的 __add__() 和 __sub__() 方法 Point class 应该是：

class Point(object):
    ...
    
    def __add__(self, other):
        return Point(self.x + other.x, self.y + other.y) #<-- MODIFIED THIS

    def __sub__(self, other):
        return Point(self.x - other.x, self.y - other.y) #<-- MODIFIED THIS

只能concatenate list(不是"Point") to list In adding and subtracting points in python

can only concatenate list (not "Point") to list In adding and subtracting points in python

python

python-class