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snippets/python/s/map-values.md

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+---
+title: Map dictionary values
+type: snippet
+language: python
+tags: [dictionary]
+cover: pineapple-laptop
+dateModified: 2020-11-02T19:28:27+02:00
+---
+
+Creates a dictionary with the same keys as the provided dictionary and values generated by running the provided function for each value.
+
+- Use `dict.items()` to iterate over the dictionary, assigning the values produced by `fn` to each key of a new dictionary.
+
+```py
+def map_values(obj, fn):
+  return dict((k, fn(v)) for k, v in obj.items())
+```
+
+```py
+users = {
+  'fred': { 'user': 'fred', 'age': 40 },
+  'pebbles': { 'user': 'pebbles', 'age': 1 }
+}
+map_values(users, lambda u : u['age']) # {'fred': 40, 'pebbles': 1}
+```