'list' object has no attribute, why is that?

Question

I am trying to pass in a list of items through a class parameter and call the method display_flavors to print the list. But I am receiving a list object has no attribute error.

I have rewritten the code that works but I want to rewrite the code to pass in a list instead of calling the method and passing through the list argument. Is it possible?

# Python script Idea to be implemented which has an error
class IceCreamStand(Restaurant):  # Inherits the Parent Class "Restaurant"
    """Attempt to represent an Ice Cream Stand"""
    def __init__(self, restaurant_name, cuisine_name, flavors):
        """Initialize the attributes of an Ice Cream Stand"""
        super().__init__(restaurant_name, cuisine_name) 
        self.flavors = flavors

    def display_flavors(self):
        """Print all the flavors the Ice Cream Stand offers"""
        print("These are flavors offered in this Ice Cream Stand:")
        for flavor in self.flavors:
            print(flavor.title())

list_of_flavors = ["chocolate", "strawberry", "banana"]
restaurant1 = IceCreamStand("Dairy King", "Dairy and Ice Cream", list_of_flavors)
restaurant1.flavors.display_flavors() 

======================================================================== Rewritten code that works

class IceCreamStand(Restaurant):  # Inherits Parent Class "Restaurant"
     """Attempt to represent an Ice Cream Stand"""
    def __init__(self, restaurant_name, cuisine_name):
        """Initialize the attributes of an Ice Cream Stand"""
        super().__init__(restaurant_name, cuisine_name)

    def display_flavors(self, flavors):
        """Print all the flavors the Ice Cream Stand offers"""
        print("These are flavors offered in this Ice Cream Stand:")
        for flavor in flavors:
            print(flavor.title())

list_of_flavors = ["chocolate", "strawberry", "banana"]
restaurant1 = IceCreamStand("Dairy King", "Dairy and Ice Cream")
restaurant1.display_flavors(list_of_flavors)

========================================================================

AttributeError: 'list' object has no attribute 'display_flavors'

Answer 1

It now works!! Thanks guys for the clarification was stuck forever with that error

# Corrected Script
class IceCreamStand(Restaurant):  # Inherits the attributes from Parent Class "Restaurant"
    """Attempt to represent an Ice Cream Stand"""

    def __init__(self, restaurant_name, cuisine_name, flavors):
        """Initialize the attributes of an Ice Cream Stand"""
        super().__init__(restaurant_name, cuisine_name)
        self.flavors = flavors

    def display_flavors(self):
        """Print all the flavors the Ice Cream Stand offers"""
        print("These are flavors offered in this Ice Cream Stand:")
        for flavor in self.flavors:
            print(flavor.title())


list_of_flavors = ["chocolate", "strawberry", "banana"]
restaurant1 = IceCreamStand("Dairy King", "Dairy and Ice Cream", list_of_flavors)
restaurant1.display_flavors()  # <<< Here is the correction 

Output:

    These are flavors offered in this Ice Cream Stand:
    Chocolate
    Strawberry
    Banana

Answer 2

When you use a dot operator to call a function, you're generally calling that function with its first argument being the thing before the dot operator. This is why we include self when we're writing methods inside a class, like display_flavors.

When you do

restaurant1.flavors.display_flavors()

then Python tries to call the method display_flavors() on the object restaurant1.flavors, with no other arguments. However, restaurant1.flavors is a list, and as a result doesn't have a method called display_flowers(). Hence your AttributeError.

Meanwhile, when you do

restaurant1.display_flavors(list_of_flavors)

you're calling the method display_flavors() on restaurant1 - which is an IceCreamStand, and which does have a method called that. Said method is given two arguments: restaurant1 (as self), and list_of_flavors.

So, doing restaurant1.display_flavors() instead of restaurant1.flavors.display_flavors() in your first example should work.