在for循环中创建嵌套字典

nested_dict = {}
for item in iterable:
    key = item['key']
    nested_key = item['nested_key']
    value = item['value']
    
    if key not in nested_dict:
        nested_dict[key] = {}
    
    nested_dict[key][nested_key] = value

products = [
    {'name': '手机', 'category': '电子产品', 'price': 1999},
    {'name': '电视', 'category': '电子产品', 'price': 3999},
    {'name': '洗衣机', 'category': '家电', 'price': 2999},
    {'name': '冰箱', 'category': '家电', 'price': 4999},
]

nested_dict = {}
for product in products:
    category = product['category']
    name = product['name']
    price = product['price']
    
    if category not in nested_dict:
        nested_dict[category] = {}
    
    nested_dict[category][name] = price

{
    '电子产品': {
        '手机': 1999,
        '电视': 3999
    },
    '家电': {
        '洗衣机': 2999,
        '冰箱': 4999
    }
}