How to Manipulate an Attribute in a Class from a Method in a Separate Class python

Question

Suppose I have the following:

class A: 



  def __init__( self, Att):

    """here Att is a string input"""

    self.Att = Att



  def __repr__( self ):

    s = "My attribute is " + self.Att 

    return s



class B: 



  def __init__( self, Btt):

    """here Btt is a string input"""

    self.Btt = Btt



  def __repr__( self ):

    s = "My other attribute is " + self.Btt 

    return s



  def SetEqual(self):

    Att = self.Btt

I realize the

SetEqual

method above will not work. But how might I go about creating a method in

class B

that will access

class A

and change the value of

self.Att

to be equal to

self.Btt

?

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Answer 1

The following method from B takes a A object and changes its value:

def setEqual(self, a):
    a.Att = self.Btt

Two remarks here.

First, Python does not know about encapsulation, so this is absolutely legal (and Pythonic) to write a.Att from the outside of the A class.

Second, be careful with the assignment, because it only makes a shallow copy. This is not a problem when manipulating immutable objects, but you might want to take a look at the copy module for deep copies.

How to Manipulate an Attribute in a Class from a Method in a Separate Class python

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