为减少功能而实施

Question

我想知道如何使用reduce函数从list of object获取特定键值。

让我传递一个对象列表以简化功能，每个对象都有一个键number，值是some integer，所以I want a sum of all values。

样本数据就像

result = [{'number':1},{`number`:2},{'number':3}]

所以在reduce中，我有结果为key而value为[objects,..]的代码，我应该如何实现？

reduce = Code(
    """
    function(key,value)
    {
        return Array.sum(value);
    }
    """
)

Answer 1

from functools import reduce
result = [{'number':1},{"number":2},{'number':3}]
c = reduce(lambda x,y:{"number":x['number']+y['number']}, result)
print(c)

"you can also use list comprehensions"

target = sum(i['number'] for i in result)
print(dict(number=target))