How to get number of attributes in a dataclass?

Question

I want to get the number of recipes I have in the Recipes class. How do I go about doing this?

from dataclasses import dataclass

@dataclass
class Recipe:
    ing1: str
    ing2: str
    ing3: str
   
class Recipes():
    pass
   
setattr(Recipes, 'Salad', Recipe('cabbage', 'lettuce', 'potato')
setattr(Recipes, 'Salad2', Recipe('tomato', 'lettuce', 'ranch')
print("There are %s number of recipes!" % # thing that gets number of attributes here #)
# prints 2

This is what I have so far. I want the thing at the end to print the number of recipes in the class (currently being 2).

Edit: I can't use dict or lists because this is just a test for something I am working on.

Answer 1

You can traverse Recipes.__dict__ to count all entries of type Recipe. This dict contains all set attributes and few other entries.

Try it online!

from dataclasses import dataclass

@dataclass
class Recipe:
    ing1: str
    ing2: str
    ing3: str
   
class Recipes():
    pass
   
setattr(Recipes, 'Salad', Recipe('cabbage', 'lettuce', 'potato'))
setattr(Recipes, 'Salad2', Recipe('tomato', 'lettuce', 'ranch'))

cnt = 0
for k, v in Recipes.__dict__.items():
    if type(v) is Recipe:
        cnt += 1

print(f"There are {cnt} number of recipes!")

Output:

There are 2 number of recipes!