Create buttons from instances of a class

Question

So I am trying to build a restaurant menu. I want to create buttons based on instances of class Food:

class Food:
    instances=[]
    def __init__(self,name,price):
        self.name=name
        self.price=price
        Food.instances.append(self)

    def __iter__(self):
        for item in Food.instances:
            yield item
    def get_name(self)
        return self.name

The code I have right now, works, but it also changes the Food.instances to button object, I want it to stay as Food objects, so I can call functions to get their name and price.

This is what I have right now:

def read_data():    #reads data from json file
    global data
    with open("restaurant\menu.json",'r') as f:
        data=json.loads(f.read())

def get_instances(json_data): #gets Food instances based on data loaded from json file
    for u in json_data:
        x=Food(**u)

def get_buttons(frame,list_aux): #makes buttons based on instances of Food class
    column=0
    rows=0
    for index,obj in enumerate(list_aux):
        if column<3:
            list_aux[index]=Button(frame,text=obj.get_name())
            list_aux[index].grid(row=rows,column=column)
            column+=1
        else:
            column=0
            rows+=1
            list_aux[index]=Button(frame,text=obj.get_name())
            list_aux[index].grid(row=rows,column=column)
            column+=1

read_data()
get_instances(data)
print(Food.instances)
list_aux=Food.instances #makes a copy of Food.instances to HOPEFULLY not mess up the class
root=Tk()
get_buttons(root,list_aux)
root.mainloop()

Before running get_buttons() function, when I print Food.instances I get:
[<__main__.Food object at 0x000001C0F0113E50>, <__main__.Food object at 0x000001C0EFD51960>, <__main__.Food object at 0x000001C0F0115A20>]

After running the function, printing list_aux results in:
[, , ]

But also, when print Food.instances, I get the same output and I lose all of the class methods written (get_name() and others I did not include here because are not relevant).

How can I keep creating those buttons, but not change Food.instances? One workaround I have found is to modify the get_instances() function to:

def get_instances(json_data):
    Food.instances=[] #this is the line that is added
    for u in json_data:
        x=Food(**u)

So I can call it again after get_buttons() function, deleting those tkinter.Button objects, creating Food objects again, and I can use the class methods as before, but I feel like this is extremly inefficient. How can I fix this?

Create buttons from instances of a class

0 Answers