Python Codes

Inverts a dictionary with non-unique hashable values.

👉Create a collections.defaultdict with list as the default value for each key.

👉Use dictionary.items() in combination with a loop to map the values of the dictionary to keys using dict.append().

👉Use dict() to convert the collections.defaultdict to a regular dictionary.

CODE:

from collections import defaultdict

def collect_dictionary(obj):
inv_obj = defaultdict(list)
for key, value in obj.items():
inv_obj[value].append(key)
return dict(inv_obj)

Example:

ages = {
'Peter': 10,
'Isabel': 10,
'Anna': 9,
}
collect_dictionary(ages)

Output: { 10: ['Peter', 'Isabel'], 9: ['Anna'] }

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5.8K viewsJul 25, 2022 at 07:34

Inverts a dictionary with non-unique hashable values.

👉Create a collections.defaultdict with list as the default value for each key.

👉Use dictionary.items() in combination with a loop to map the values of the dictionary to keys using dict.append().

👉Use dict() to convert the collections.defaultdict to a regular dictionary.

CODE:

from collections import defaultdict

def collect_dictionary(obj):
inv_obj = defaultdict(list)
for key, value in obj.items():
inv_obj[value].append(key)
return dict(inv_obj)

Example:

ages = {
'Peter': 10,
'Isabel': 10,
'Anna': 9,
}
collect_dictionary(ages)

Output: { 10: ['Peter', 'Isabel'], 9: ['Anna'] }

Share and Support
@Python_Codes

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