How to create Python dictionary with duplicate keys?

Python dictionary doesn't allow key to be repeated. However, we can use defaultdict to find a workaround. This class is defined in collections module.

Use list as default factory for defaultdict object

>>> from collections import defaultdict
>>> d=defaultdict(list)

Here is a list of tuples each with two items. First item is found to be repeatedly used. This list is converted in defaultdict

>>> for k,v in l:

Convert this defaultdict in a dictionary object using dict() function

>>> dict(d)
{1: [111, 'aaa'], 2: [222, 'bbb'], 3: [333, 'ccc']}

Updated on: 04-Dec-2019

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