32 lines
819 B
Markdown
32 lines
819 B
Markdown
---
|
|
title: Combine dictionary values
|
|
type: snippet
|
|
tags: [dictionary]
|
|
cover: fruit-feast
|
|
dateModified: 2021-04-04T14:32:35+03:00
|
|
---
|
|
|
|
Combines two or more dictionaries, creating a list of values for each key.
|
|
|
|
- Create a new `collections.defaultdict` with `list` as the default value for each key and loop over `dicts`.
|
|
- Use `dict.append()` to map the values of the dictionary to keys.
|
|
- Use `dict()` to convert the `collections.defaultdict` to a regular dictionary.
|
|
|
|
```py
|
|
from collections import defaultdict
|
|
|
|
def combine_values(*dicts):
|
|
res = defaultdict(list)
|
|
for d in dicts:
|
|
for key in d:
|
|
res[key].append(d[key])
|
|
return dict(res)
|
|
```
|
|
|
|
```py
|
|
d1 = {'a': 1, 'b': 'foo', 'c': 400}
|
|
d2 = {'a': 3, 'b': 200, 'd': 400}
|
|
|
|
combine_values(d1, d2) # {'a': [1, 3], 'b': ['foo', 200], 'c': [400], 'd': [400]}
|
|
```
|