Python Object-Oriented Python Inheritance Multiple Superclasses

saikiran maddukuri
saikiran maddukuri
17,905 Points

can't understand why super class used in sneaky and agile

import random

class Sneaky:
    sneaky = True

    def __init__(self, sneaky=True, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.sneaky = sneaky

    def hide(self, light_level):
        return self.sneaky and light_level < 10
class Agile:
    agile = True

    def __init__(self, agile=True, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.agile = agile

    def evade(self):
        return self.agile and random.randint(0, 1)

Hi this was given in work-space to fallow along with the lecture now what my doubt in this snippet was classes Sneaky and Agile hadn't inherited any class but it had passed to the super class instance __init__ method i can't understand to what instance __init__ method arguments will be passed.

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1 Answer

Louise St. Germain
Louise St. Germain
19,385 Points

Hi Saikiran,

Chris Freeman has given a couple of excellent answers to this in other forum discussions where people had similar questions. Have a look through this shorter version and longer version, which I hope you will find helpful!

saikiran maddukuri
saikiran maddukuri
17,905 Points

still not understand it said the extra arguments will be passed down to lower chain of MRO but hear in the code which i tried was facing an error.

class parent1:
  def __init__(self,name="",*args,**kwargs):
    super().__init__(*args,**kwargs) 
    self.name=name
class parent2:
  def ___init__(self,age=0):
    self.age=age
class child(parent1,parent2):
  def __init__(self,*args,**kwargs):
    super().__init__(*args,**kwargs)
  def kowt(self):
    return 'hi'

when i run commands in REPL i expected

>>> ch=child(name="sai",age=19)
>>> ch.name
'sai'
>>ch.age
19

but what i get was

>>> ch=child(name="sai",age=20)                                                                                                                                 
Traceback (most recent call last):                                                                                                                              
  File "<stdin>", line 1, in <module>                                                                                                                           
  File "/home/treehouse/workspace/parents.py", line 10, in __init__                                                                                             
    super().__init__(*args,**kwargs)                                                                                                                            
  File "/home/treehouse/workspace/parents.py", line 3, in __init__                                                                                              
    super().__init__(*args,**kwargs)                                                                                                                            
TypeError: object.__init__() takes no parameters         

can you please modify the code to get the expected solution

saikiran maddukuri
saikiran maddukuri
17,905 Points

thank your so much i got it now in simple way A simple explanation, thank you both. I'm afraid the instructor failed to mention that calling multiple classes in the creation of an instance creates a hierarchy of parenthood.

So if it was

class Thief(Agile, Sneaky, Character):
    def pickpocket(self):
        return self.sneaky and bool(random.randint(0, 1))

We would have:

Agile as the child of Sneaky Sneaky as the child of Character I guess Thief is the child of Agile?

right??? got it from Jay Reyes comment