How to access attribute of second or other definition from the same class in Python

Question

This sounds easy but I cannot get it working. I would like to access the attribute dataSource from the following sample code (I can get the first ones with eg print(A.data) just fine but I want the one from the second function from the same class:

class myclass():
  def __init__(self):
      self.data = [1,2,3]
      self.other_data = [4,5,6]

  def other(self):
      self.dataSource = 'i want this string'



A = myclass()
print(A.dataSource)

Answer 1

You haven't created the attribute dataSource yet, so you can't access it. If you always want an object of type myclass to have that attribute, create it in the __init__ function.

Alternately, call the A.other() function first, then try printing A.dataSource

Answer 2

You have to call your other method first, as this is where you create the datasource attribute of your instance:

a = myclass()
a.other()

Then you can access it by:

print(a.dataSource)

Or, to answer your comment, if you want to use getattr :

print(getattr(a, 'dataSource'))

Answer 3

You need to call A.other() method:

>>> a.other()
>>> a.dataSource
'i want this string'