Python嵌套字典理解返回空字典(Python nested dictionary comprehension returns empty dictionaries)

Python嵌套字典理解返回空字典(Python nested dictionary comprehension returns empty dictionaries)

我正在使用字典理解来提取嵌套值。 我有以下代码（作为示例）：

d = {1: 'a', 2: 'b', 3: 'c'} e = {4: 'd', 5: 'e', 6: 'f'} f = {7: 'g', 8: 'h', 9: 'i'} # stick them together into another dict data_dict = {'one': d, 'two': e, 'three': f} #say we're looking for the key 8 output = {outer_key: {inner_key: inner_value for inner_key, inner_value in outer_value.items() if inner_key == 8} for outer_key, outer_value in data_dict.items()} output = {'one': {}, 'three': {8: 'h'}, 'two': {}}

我需要做些什么来获得JUST'三'及其价值？ 我不想返回空的比赛。

谢谢

I'm using dictionary comprehension to pull out a nested value. I have the following code (as a sample):

d = {1: 'a', 2: 'b', 3: 'c'} e = {4: 'd', 5: 'e', 6: 'f'} f = {7: 'g', 8: 'h', 9: 'i'} # stick them together into another dict data_dict = {'one': d, 'two': e, 'three': f} #say we're looking for the key 8 output = {outer_key: {inner_key: inner_value for inner_key, inner_value in outer_value.items() if inner_key == 8} for outer_key, outer_value in data_dict.items()} output = {'one': {}, 'three': {8: 'h'}, 'two': {}}

what do I need to do to get JUST 'three' and its value? I don't want to return empty matches.

thx

最满意答案

像这样的东西：

>>> {k: {8: v[8]} for k, v in data_dict.items() if 8 in v} {'three': {8: 'h'}}

Something like this:

>>> {k: {8: v[8]} for k, v in data_dict.items() if 8 in v} {'three': {8: 'h'}}