I couldn’t find a solution to this anywhere, but I’ve used a method in my parent class (Wallet) to print the name of the class when I call the method function in the script.
The problem is that the name is still showing as that of the parent class, even when i have created a ‘Pen’ class to inherit the attributes and methods of the ‘Wallet’ class.
class Wallet():
def __init__(self,colour,size,material,cost):
print("A Wallet Object Class has been made")
self.colour = colour
self.size = size
self.material = material
self.cost = cost
def colour_call(self):
print(f"The colour of the {__class__.__name__} is {self.colour}")
def size_call(self):
print(f"The size of the {__class__.__name__} is {self.size}")
def material_call(self):
print(f"The material is made of {self.material}")
def cost_call(self):
print(f"The cost of the {__class__.__name__} is {self.cost}")
Here i used the __class__.__name__ to refer to the name of the class itself.
class Pen(Wallet):
def __init__(self, colour, size, material, cost):
super().__init__(colour, size, material, cost)
print(f"A {__class__.__name__} Object Class has inherited from the Wallet Class")
I then created this pen class to inherit the same attributes and methods as the Wallet class.
mywallet = Wallet(colour = "red", size = "Large", material = "leather", cost = 2.50)
mypen = Pen(colour = "blue", size = "small", material = "aluminium", cost = 1.50)
for item in [mywallet,mypen]:
item.colour_call()
item.size_call()
item.material_call()
here when i try to use polymorphism to return the method calls, it prints the following:
The colour of the Wallet is red
The size of the Wallet is Large
The material is made of leather
The colour of the Wallet is blue
The size of the Wallet is small
The material is made of aluminium
Even for the Pen class, it is using the class name of the Wallet. I was expecting it to be ‘Pen’ (The size of the Pen is small…) Any ideas?
It works if I just call the instance of the attributes and manually print the result like below, but I wanted to do it that way just for curiosity.
for item in [mywallet,mypen]:
print(f"The colour of the {item.__class__.__name__} is "+item.colour+".",
f"The material of the {item.__class__.__name__} is "+item.material+".")
0
Don’t use the special variable __class__, the whole point of that variable is to provide the class that the method is defined in. It exists to support the zero-argument form of super.
Use:
type(self).__name__
or the equivalent
self.__class__.__name__
It isn’t clear why you used the special variable __class__ to begin with, it’s a rather arcane piece of trivia to know it even exists. Anyway, the above approaches are the way to get the class of an arbitrary object, you already seem to know it yourself since you correctly used item.__class__!
As an aside, you inheritance hierarchy doesn’t make sense conceptually, a pen is not a wallet, and so it shouldn’t inherit from wallet. You probably want your Wallet class to be a base Item class or something like that, that both Wallet and Pen inherit from.
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