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snippets/python/s/map-dictionary.md

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+---
+title: Map list to dictionary
+type: snippet
+language: python
+tags: [list,dictionary]
+excerpt: Maps the values of a list to a dictionary using a function.
+cover: colors-mural
+dateModified: 2020-11-02T19:28:27+02:00
+---
+
+Maps the values of a list to a dictionary using a function, where the key-value pairs consist of the original value as the key and the result of the function as the value.
+
+- Use `map()` to apply `fn` to each value of the list.
+- Use `zip()` to pair original values to the values produced by `fn`.
+- Use `dict()` to return an appropriate dictionary.
+
+```py
+def map_dictionary(itr, fn):
+  return dict(zip(itr, map(fn, itr)))
+```
+
+```py
+map_dictionary([1, 2, 3], lambda x: x * x) # { 1: 1, 2: 4, 3: 9 }
+```