简单的函数组合 class 不起作用（缺少 2 个必需的位置参数）

Question

我目前正在研究数学并尝试构建一个简单的函数组合器

https://en.wikipedia.org/wiki/Function_composition

我要告诉程序：

查看两个元组并进行比较：

tuple_1 = (2,4)
tuple_2 = (5,2)

tuple_2[1]和tuple_1[0]的值相同吗？（都= 2）

如果是：

Return tuple(tuple_2[0]) 和 tuple_1[1]

5 4

我的功能有效：

list_of_tuples_1 = [
    (2,4),
    (2,5)    
    ]

list_of_tuples_2 = [
    (1,2),
    (5,2)
    ]

def give_function_composition(list_1, list_2):
    for tuples_2 in list_2:
        for tuples_1 in list_1:
            if tuples_2[1] == tuples_1[0]:
                return(str(tuples_2[0]) + " " + str(tuples_1[1]))

                
print(give_function_composition(list_of_tuples_1, list_of_tuples_2))

我的class没有：

class Function_Composition():
    def __init__(self, list_1, list_2):
        self.list_1 = list_1
        self.list_2 = list_2
        
    def give_function_composition(self, list_1, list_2):
        for tuples_2 in list_2:
            for tuples_1 in list_1:
                if tuples_2[1] == tuples_1[0]:
                    return(str(tuples_2[0]) + " " + str(tuples_1[1]))        

                
my_set_1 = Function_Composition([(3,5),(1,5),(5,4)],
                                 [(5,7),(3,6),(1,8)])

print(my_set_1.give_function_composition())

TypeError: give_function_composition() missing 2 required positional arguments: 'list_1' and 'list_2'

这里有什么问题？我给了他两张单子对不对？

Answer 1

您应该引用传递给构造函数的实例数据，而不是两次传递同一个列表：

class Function_Composition():
    def __init__(self, list_1, list_2):
        self.list_of_tuples_01 = list_1
        self.list_of_tuples_02 = list_2
        
    def give_function_composition(self):
        for tuples_2 in self.list_of_tuples_02:
            for tuples_1 in self.list_of_tuples_01:
                if tuples_2[1] == tuples_1[0]:
                    return(str(tuples_2[0]) + " " + str(tuples_1[1]))
        return "No relation found."

                
my_set_1 = Function_Composition([(3,5),(1,5),(5,4)],
                                 [(5,7),(3,6),(1,8)])

print(my_set_1.give_function_composition())

这输出：

No relation found.

简单的函数组合 class 不起作用（缺少 2 个必需的位置参数）

Simple function-composition class does not work (missing 2 required positional arguments)

python

class

math

function-composition