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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