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Isabelle Viktoria Maciohsek
2022-02-10 22:09:42 +02:00
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snippets/collect_dictionary.md
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---
title: collect_dictionary
title: Invert dictionary
tags: dictionary,intermediate
firstSeen: 2020-04-07T21:15:06+03:00
lastUpdated: 2020-11-02T19:27:07+02:00
@ -7,7 +7,7 @@ lastUpdated: 2020-11-02T19:27:07+02:00
Inverts a dictionary with non-unique hashable values.
- Create a `collections.defaultdict` with `list` as the default value for each key.
- 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.