3 replies

Python issue with inheritence

I'm trying to check if a inherited class is an instance of it's superclass. But the inherited class and the super class are in separate files.

I'm importing the inherited class with importlib as a dynamic import.

So for example:
python1.py:

class MySuperClass:
  pass

class MySuperClass:
  pass

class MySuperClass:
  pass

class MySuperClass:
  pass

python2.py:

from python1 import MySuperClass

class MyInheritedClass(MySuperClass):
  pass

from python1 import MySuperClass

class MyInheritedClass(MySuperClass):
  pass

from python1 import MySuperClass

class MyInheritedClass(MySuperClass):
  pass

from python1 import MySuperClass

class MyInheritedClass(MySuperClass):
  pass

python3.py:

import importlib
from python1 import MySuperClass

module = importlib.import_module('python2')
inheritedClass = getattr(module, 'MyInheritedClass')
if isinstance(inheritedClass, MySuperClass):
  print("MyInheritedClass is instance of MySuperClass")
else:
  print("MyInheritedClass isn't an instance of MySuperClass")

import importlib
from python1 import MySuperClass

module = importlib.import_module('python2')
inheritedClass = getattr(module, 'MyInheritedClass')
if isinstance(inheritedClass, MySuperClass):
  print("MyInheritedClass is instance of MySuperClass")
else:
  print("MyInheritedClass isn't an instance of MySuperClass")

import importlib
from python1 import MySuperClass

module = importlib.import_module('python2')
inheritedClass = getattr(module, 'MyInheritedClass')
if isinstance(inheritedClass, MySuperClass):
  print("MyInheritedClass is instance of MySuperClass")
else:
  print("MyInheritedClass isn't an instance of MySuperClass")

import importlib
from python1 import MySuperClass

module = importlib.import_module('python2')
inheritedClass = getattr(module, 'MyInheritedClass')
if isinstance(inheritedClass, MySuperClass):
  print("MyInheritedClass is instance of MySuperClass")
else:
  print("MyInheritedClass isn't an instance of MySuperClass")

This prints: MyInheritedClass isn't an instance of MySuperClass

Does anyone know why that is the case?

Python issue with inheritence

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