Question

I would like to know how to convert parent object that was return by some function to child class.

class A(object):
    def __init__():
        pass

class B(A):
    def functionIneed():
        pass

i = module.getObject() # i will get object that is class A
j = B(i) # this will return exception
j.functionIneed()

I cannot change class A. If I could I would implement functionIneed to class A, but it is impossible because of structure of code.

Answer 1

Python does not support “casting”. You will need to write B.__init__() so that it can take an A and initialize itself appropriately.