Call multiple attributes from one class into another - Python

Question

I'm working with multiple classes that share some initial common variables/attributes. In order to make it cleaner and avoid calling the same variables multiple times I want to set them all in an initial class (e.g. classA) and then load all this attributes in a classB.

So I would define:

class classA:
   def __init__(self, varA, varB, varC, ..., varZ):
      self.varA = varA
      self.varB = varB
      self.varC = varC
      (...)
      self.varZ = varZ

And then load it in a second classB

class classB:
   def __init__(self, classA):
      self.varA = classA.varA
      self.varB = classA.varB
      self.varC = classA.varC
      (...)
      self.varZ = classA.varZ

Is there a better way to make this happen, without going over all the individual attributes?

If classB is fully derived from classA, you could inherit B from A like Rakesh suggests. If it shares only some attributes, you could have a common base class classCommon and have both classA and classB inherit from that one — pho
– pho, Commented Apr 14, 2021 at 17:22
I may be wrong, but from my understanding by just inheriting I would have to input all the variables again when calling classB, instead of just calling classB(classA) in the script. — T. Silva
– T. Silva, Commented Apr 14, 2021 at 17:25

Maurice Meyer · Accepted Answer · 2021-04-14 17:49:13Z

1

You could use argument unpacking and inheritance:

class A:
    def __init__(self, *args, **kwargs):
        for k, v in kwargs.items():
            setattr(self, k, v)


class B(A):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)


data = {'varA': 'a', 'varB': 'b', 'varC': 'c'}
a = A(**data)
b = B(**data)

print(a.varB == b.varB)

Out:

True

answered Apr 14, 2021 at 17:49

Maurice Meyer

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