# przeróbka do https://pastebin.com/bMqBxaa2

flashcards = [
    {
        "id": 1,
        "pytanie": "cokolwiek",
        "back_side": {
            "answer": "NIe wiem",
            "code": ""
        }
    },
    {
        "id": 2,
        "pytanie": "ahahahha",
        "back_side": {
            "answer": "NIe wiem",
            "code": ""
        }
    },
    {
        "id": 3,
        "pytanie": "lblblbbl",
        "back_side": {
            "answer": "sdkfjsdkjfskd",
            "code": ""
        }
    },
]

packages = [ # {name: ids}
    {"first_packages": [1, 3]},
    {"second_packages": [2, 3]},
]

# przerobiona wersja

def get_packages():
    all_packages = list()
    
    for pack in packages:
        for name, ids in pack.items():
            
            selected_cards = []
            
            for number in ids:
                for card in flashcards:
                    if card['id'] == number:
                        selected_cards.append(card)
                        
            all_packages.append({name: selected_cards})         

    return all_packages

get_packages()

# przerobiona wersja zamieniona częściowo w list comprehension

def get_packages():
    all_packages = list()
    
    for pack in packages:
        for name, ids in pack.items():
            
            # list comprehension
            selected_cards = [card
                for number in ids
                    for card in flashcards
                        if card['id'] == number
            ]
                        
            all_packages.append({name: selected_cards})         

    return all_packages

get_packages()