取嵌套字典嵌套值的总和 [英] Taking sums of nested values of nested dictionary

问题描述

我有一个嵌套字典

 dict_features =  {'agitacia/6.txt': {'samoprezentacia': 0, 'oskorblenie': 1},
                   'agitacia/21.txt': {'samoprezentacia': 0, 'oskorblenie': 0}}

我正在尝试输出一个新的字典 features_agit_sum ，它由前一个字典中的一个键组成，一个更深字典。所以我需要总和0 + 1这是int类型。输出应该是：

I'm trying to output a new dictionary features_agit_sum which consists of a key from a previous dictionary and a sum of values of a "deeper" dictionary. So I need to sum 0+1 that is int type. The output should be:

{'agitacia/6.txt': 1, 'agitacia/21.txt': 0}

以下是不同错误的几次尝试;不要如何正确迭代：

Below are several attempts with different errors; don't how to iterate correctly:

features_agit_sum = {}
def vector_agit_sum(dict_features):
    for key, value in dict_features:
        features_agit_sum[key] = sum(dict_features.items()[key])
        print (features_agit_sum)
    return features_agit_sum

ValueError：要解压缩的值太多（预期2）
dict_features.items（）[key] - 尝试访问更深层次的

ValueError: too many values to unpack (expected 2) dict_features.items()[key] - try to access deeper dict

features_agit_sum = {}
def vector_agit_sum(dict_features):
    for key in dict_features:
        for item, value in dict_features.items():
            features_agit_sum[key] = sum([item])
            print (features_agit_sum)
    return features_agit_sum

TypeError：不支持的操作数类型+：'int'和'str' - 为什么
是整数！

TypeError: unsupported operand type(s) for +: 'int' and 'str' - Why, it's integers!

features_agit_sum = {}
def vector_agit_sum(dict_features):
    files = dict_features.keys()
    for key, value in dict_features.items():
        features_agit_sum[files] = sum(dict_features.items()[key])
        print (features_agit_sum)
    return features_agit_sum

TypeError：'dict_items'对象不可下标

TypeError: 'dict_items' object is not subscriptable

推荐答案

使用字母理解：

{key: sum(value.itervalues()) for key, value in dict_features.iteritems()}

如果你使用Python 3，删除 iter 前缀，所以使用 .values（）和 .items（）。

If you are using Python 3, remove the iter prefixes, so use .values() and .items().

演示：

>>> dict_features =  {'agitacia/6.txt': {'samoprezentacia': 0, 'oskorblenie': 1}, 'agitacia/21.txt': {'samoprezentacia': 0, 'oskorblenie': 0}}
>>> {key: sum(value.itervalues()) for key, value in dict_features.iteritems()}
{'agitacia/21.txt': 0, 'agitacia/6.txt': 1}

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