Inheritance question?

Question

Hi everyone!

My question to inheritance in Python. I am trying to create a superclass called pieces which the class GreenPawns inherits from. I then want to create a list of instances of GreenPawns, but am running into trouble. I get the error message:

'TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases'

I am not sure why. I am trying to understand OOP. I attached the code I wrote in the comments. Can anyone tell me what I am doing wrong? Thank you.

Answer 1

I'm not too familiar with Python's way with inheritance, but looking at line 10, I can't help noticing how can you pass the class constructor's arguments on that line. Shouldn't those values be passed and read in inside the class' constructor?

Answer 2

Am also not much familier with python, but
as @ipang said,
inheritence syntax is like :

class A:
#code

class B(A):
#code

And ' __init__( ) ' method is a contructor, for a class.
So add parameters list to constuctor __init__( ) and pass parameters in object calling...

edit: corrected sample

greenpawns =[]

class Pieces():
def __init__ (self, color, letter, start_range):
self.color = color
self.letter = letter
self.start_range = start_range

class GreenPawns(Pieces):
def __init__(self, *args):
super().__init__(*args)

greenpawns.append(GreenPawns('green', 'P', range(8,16)))

print(greenpawns[0].color)

hope it helps....

Answer 3

Hi Jayakrishna🇮🇳, very nice, clean solution and exactly what I was looking for! Thanks! :)

Answer 4

https://code.sololearn.com/cEles0exQ1q3/?ref=app

Answer 5

lpang, Thank you for your help, I remember you helping me before. I see what you mean, where the parameters should be declared inside the GreenPawns constructor. That helps me create the new class from Pieces, which is what I was trying to do. As far as resolving the issue, I think I still just need to experiment more. I am self-taught, and trying to create a chess game. Anyway, thank you for helping me!