python按字段将记录分组在一起

from itertools import groupby

# 示例数据集
records = [
    {'name': 'Alice', 'age': 25, 'city': 'New York'},
    {'name': 'Bob', 'age': 30, 'city': 'London'},
    {'name': 'Charlie', 'age': 25, 'city': 'New York'},
    {'name': 'Dave', 'age': 35, 'city': 'London'},
    {'name': 'Eve', 'age': 30, 'city': 'New York'}
]

# 定义键函数
key_func = lambda record: record['age']

# 按字段分组
grouped_records = groupby(sorted(records, key=key_func), key_func)

# 遍历分组结果
for key, group in grouped_records:
    print(f"Age: {key}")
    for record in group:
        print(record)
    print()