/Python/Defaultdict python dict inside dict

Defaultdict python dict inside dict

Python defaultdict to dict

>>> #You can simply call dict:
>>> a
defaultdict(<type 'list'>, {'1': ['b', 'a'], '3': ['b'], '2': ['a']})
>>> dict(a)
{'1': ['b', 'a'], '3': ['b'], '2': ['a']}

# but remember that a defaultdict is a dict
# (with some special behavior, check source):
>>> isinstance(a, dict)
True

Source: stackoverflow.com

Defaultdict python dict inside dict

nums = [1, 2, 1, 1, 4, -4, 2, 2, 4, 2, 5, 7]
dict_in_dict = defaultdict(dict)
for i in range(0, len(nums), 3):
    dict_in_dict[nums[i+1]][nums[i]] = -1*nums[i+2]
dict(dict_in_dict)

# result
# {2: {1: -1, 2: -4}, 4: {1: 4}, 5: {2: -7}}

Similar codes

0 vote178 views1 answer
Python max value of list of tuples
Python
0 vote140 views1 answer
Swift bool to string
Python
0 vote137 views1 answer
Adding new fields in ModelAdmin with fieldsets to edit user, and add_fieldsets whan creating a new user
Python
5 votes127 views2 answers
Matplotlib axes labels
Python
0 vote132 views1 answer
Python Split list into chunks using for loop
Python
1 vote157 views1 answer
How to import data from csv to jupyter notebook
Python
34 votes147 views6 answers
Name columns pandas
Python
0 vote171 views1 answer
How to deploy to heroku djangorest framework app
Python Django
6 votes140 views2 answers
How to find index of maximum value in dataframe in python
Python
4 votes100 views1 answer
Declaring a numpy array with certain size
Python