Setting self as an instance from another class doesn't work [Python]-CodePudding

Let's assume I have a class A and a class B.

class A:
    def __init__(self):
        self.variable1 = 1
        self.variable2 = 'sometext'

class B:

    def __init__(self, inst):
        self = inst
        print(self.__dict__.keys(), inst.__dict__.keys())

The print function returns

b = B(inst)
dict_keys(['variable1', 'variable2']) dict_keys(['variable1', 'variable2'])

However when I try

b.variable1

It returns the following error

AttributeError: 'B' object has no attribute 'variable1'

In my more complex code I need almost all variable from class A in class B. I tried using class inheritance however I couldn't make it work with class methods and constructors. Is there a reason why the above method doesn't work?

Thx

CodePudding user response：

You're trying to overwrite self, but that only works while you're in the init. Instead, try assigning the inst to a variable of the class B:

class B:
    def __init__(self, inst):
        self.inst = inst
        print(self.__dict__.keys(), inst.__dict__.keys())

Now you can access the variables of class A via:

inst = A()
b = B(inst)
b.inst.variable1

Not sure what you're trying to achieve here exactly, but you could also initiate the class A object inside the init of class B instead of passing the object to class B.

CodePudding user response：

To use variable from class A in B you have to access to class A from B. Then execute class B

class A:
    variable1 = 1
    variable2 = 'sometext'

class B:
    def __init__(self, inst=None):
        self.f1 = A().variable1
        self.f2 = A().variable2
    def get_var(self):
        print (self.f1)

B().get_var()