23 lines
666 B
Markdown
23 lines
666 B
Markdown
---
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title: Map list to dictionary
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tags: list,dictionary
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expertise: intermediate
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firstSeen: 2020-04-07T19:53:48+03:00
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lastUpdated: 2020-11-02T19:28:27+02:00
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---
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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.
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- Use `map()` to apply `fn` to each value of the list.
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- Use `zip()` to pair original values to the values produced by `fn`.
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- Use `dict()` to return an appropriate dictionary.
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```py
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def map_dictionary(itr, fn):
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return dict(zip(itr, map(fn, itr)))
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```
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```py
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map_dictionary([1, 2, 3], lambda x: x * x) # { 1: 1, 2: 4, 3: 9 }
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```
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