from collections import defaultdict

Unusual Unicorn answered on April 6, 2020 Popularity 10/10 Helpfulness 4/10

answer from collections import defaultdict

related COLLECTIONS.DEFAULTDICT(set)

from collections import defaultdict

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>>> s = [('yellow', 1), ('blue', 2), ('yellow', 3), ('blue', 4), ('red', 1)]
>>> d = defaultdict(list)
>>> for k, v in s:
...     d[k].append(v)
...
>>> d.items()
[('blue', [2, 4]), ('red', [1]), ('yellow', [1, 3])]

Popularity 10/10 Helpfulness 4/10 Language python

Source: docs.python.org

Tags: collections defaultdict import python

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Contributed on Apr 06 2020

Unusual Unicorn

0 Answers Avg Quality 2/10

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COLLECTIONS.DEFAULTDICT(set)

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defaultdict means that if a key is not found in the dictionary,
then instead of a KeyError being thrown, a new entry is created. 
The type of this new entry is given by the argument of defaultdict.

For example:

somedict = {}
print(somedict[3]) # KeyError

someddict = defaultdict(int)
print(someddict[3]) # print int(), thus 0

>>> from collections import defaultdict

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Source: Grepper

Tags: python py

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Contributed on Jan 21 2022

Concerned Crab

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from collections import defaultdict

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COLLECTIONS.DEFAULTDICT(set)

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