从 class 外部或内部的方法调用多个变量中的一个

Question

I tried looking but couldn't find an answer.

this is my code -

class abcd():
    def __init__(self):
        pass
    def call_from_method_1(self):
        self.a = "value of variable a"
        self.b = 'value of variable b'
        print(self.a + ',', self.b)

    def call_from_method_2(self):
        self.c = 'var c'
        self.d = 'var d'

    def call_specific_variable_from_each_method(self):
        return abcd().call_from_method_1()               # in this line how do I call just the variable b
        return abcd().call_from_method_2()               # and in this line call just d

if True:
    abcd().call_specific_variable_from_each_method()         #so I could print them both in this line

I need to call JUST the variable b from def call_from_method_1(self): and JUST the variable d from def call_from_method_2(self): and call them into def call_specific_variable_from_each_method(self): . I also have to keep both methods intact if possible so if I instantiate the methods it also prints out print(self.a + ',', self.b) from call_from_method_1(self): which is not desired.

As mentioned both methods have to be intact and still print just a specific variable from either method outside of the class without having to completely run both methods by instantiating them.

Also as a bonus how do I use if statement in list comprehension to finally call the class? so I tried abcd().call_specific_variable_from_each_method() if True but doesn't work. Any Ideas?

It would really help if the solution is not a workaround. But I'm open to whatever solutions.

Answer 1

Your code isn't going to work as-is.

Firstly, you need to instantiate the class abcd in order to call the methods.

Secondly, in call_specific_variable_from_each_method(self): you return the abcd()... calls. They are just going to return None. You haven't returned anything in any of the methods. Thirdly, this call returns the first None only.

class abcd():

    def __init__(self):
        self.call_from_method_1()
        self.call_from_method_2()

    def call_from_method_1(self):
        self.a = "value of variable a"
        self.b = 'value of variable b'
        return self.b

    def call_from_method_2(self):
        self.c = 'var c'
        self.d = 'var d'
        return self.d

    def call_specific_variable_from_each_method(self):
        return self.call_from_method_1(), self.call_from_method_2()


abcd_obj = abcd()
b, d = abcd_obj.call_specific_variable_from_each_method()
print(b, d)