CODEWITHSUNDEEP
pythondictionary
Aharon Snyder
Aharon Snyder

Reputation: 45

Adding key:value pair in a dictionary within a dictionary

How do I add key: value pairs to a dictionary within a dictionary in Python? I need to take an input of a dictionary and sort the results by the type of the key:

new_d = {'int':{}, 'float':{}, 'str':{}}
temp = {}
for key in d:
    temp[key] = d[key]
    print temp
    if type(key) == str:
        new_d['str'] = temp
        temp.clear()
    elif type(key) == int:
        print 'int'
        temp.clear()
    elif type(key) == float:
        print 'float'
        temp.clear()

This is what I have and nothing is writing to the new_d dictionary.

Output should look like this

>>> new_d = type_subdicts({1: 'hi', 3.0: '5', 'hi': 5, 'hello': 10})
>>> new_d[int]
{1: 'hi'}
>>> new_d[float]
{3.0: '5'}
>>> new_d[str] == {'hi': 5, 'hello': 10}
True
"""

Upvotes: 0

Views: 204

Answers (1)

TigerhawkT3
TigerhawkT3

Reputation: 49330

You don't need a temporary dictionary for that. You can use the types directly as keys, too.

d = {1:'a', 'c':[5], 1.1:3}
result = {int:{}, float:{}, str:{}}
for k in d:
    result[type(k)][k] = d[k]

Result:

>>> result
{<class 'float'>: {1.1: 3}, <class 'str'>: {'c': [5]}, <class 'int'>: {1: 'a'}}
>>> result[float]
{1.1: 3}

If you want, you can use collections.defaultdict to automatically add keys of the necessary type if they don't yet exist, instead of hard-coding them:

import collections
d = {1:'a', 'c':[5], 1.1:3}
result = collections.defaultdict(dict)
for k in d:
    result[type(k)][k] = d[k]

Result:

>>> result
defaultdict(<class 'dict'>, {<class 'float'>: {1.1: 3}, <class 'str'>: {'c': [5]}, <class 'int'>: {1: 'a'}})
>>> result[float]
{1.1: 3}

Upvotes: 4

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