Query list of keys having a specific lower-level key in a nested dictionary in Python

Question

My data looks like this:

data = {'Shop1': {'Fruit': {2021: 5},
      'Veggies': {2021: 10}},
     'Shop2': {'Veggies': {2021: 6}},
     'Shop3': {'Veggies': {2021: 4}},
     'Shop4': {'Meat': {2021: 8},
      'Veggies': {2021: 9},
      'Cheese': {2021: 6},
      'Sweets': {2021: 9},
      'Drinks': {2021: 15}}}}

Shop1 , Shop2 , Shop3 and Shop4 ... are my primary keys whereas Fruit, Veggies and other products are my nested keys. I'm trying to find a way to query this dictionary in order to display the list of shops with Veggies AND without Fruit . In this case, the result would be ['Shop2', 'Shop3', 'Shop4'] .

Any idea how to do that?

Answer 1

Use a simple list comprehension:

[k for k,d in data.items() if 'Veggies' in d and not 'Fruit' in d]

output: ['Shop2', 'Shop3', 'Shop4']