如何在没有pandas的python中进行groupby

data = [
    {'category': 'A', 'value': 1},
    {'category': 'B', 'value': 2},
    {'category': 'A', 'value': 3},
    {'category': 'B', 'value': 4},
    {'category': 'A', 'value': 5}
]

groups = {}
for item in data:
    category = item['category']
    if category not in groups:
        groups[category] = []
    groups[category].append(item)

for category, items in groups.items():
    # 在这里执行你想要的操作
    # 例如计算平均值
    total = sum(item['value'] for item in items)
    count = len(items)
    average = total / count
    print(f"Category: {category}, Average value: {average}")