使用自定义映射从列表创建嵌套词典

def create_nested_dict(data_list, mapping):
    nested_dict = {}
    for item in data_list:
        key = mapping(item)
        if key in nested_dict:
            nested_dict[key].append(item)
        else:
            nested_dict[key] = [item]
    return nested_dict

# 示例数据列表
data_list = [
    {'name': 'Alice', 'age': 25, 'gender': 'female'},
    {'name': 'Bob', 'age': 30, 'gender': 'male'},
    {'name': 'Charlie', 'age': 35, 'gender': 'male'},
    {'name': 'David', 'age': 28, 'gender': 'male'},
    {'name': 'Eve', 'age': 27, 'gender': 'female'}
]

# 自定义映射规则，将元素的性别作为键
def gender_mapping(item):
    return item['gender']

# 使用自定义映射从列表创建嵌套词典
result = create_nested_dict(data_list, gender_mapping)
print(result)

{
    'female': [
        {'name': 'Alice', 'age': 25, 'gender': 'female'},
        {'name': 'Eve', 'age': 27, 'gender': 'female'}
    ],
    'male': [
        {'name': 'Bob', 'age': 30, 'gender': 'male'},
        {'name': 'Charlie', 'age': 35, 'gender': 'male'},
        {'name': 'David', 'age': 28, 'gender': 'male'}
    ]
}