25 lines
680 B
Markdown
25 lines
680 B
Markdown
---
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title: Map dictionary values
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tags: dictionary
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expertise: intermediate
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firstSeen: 2019-08-20T15:34:30+03:00
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lastUpdated: 2020-11-02T19:28:27+02:00
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---
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Creates a dictionary with the same keys as the provided dictionary and values generated by running the provided function for each value.
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- Use `dict.items()` to iterate over the dictionary, assigning the values produced by `fn` to each key of a new dictionary.
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```py
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def map_values(obj, fn):
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return dict((k, fn(v)) for k, v in obj.items())
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```
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```py
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users = {
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'fred': { 'user': 'fred', 'age': 40 },
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'pebbles': { 'user': 'pebbles', 'age': 1 }
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}
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map_values(users, lambda u : u['age']) # {'fred': 40, 'pebbles': 1}
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```
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