36 lines
803 B
Markdown
36 lines
803 B
Markdown
---
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title: Get nested value
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type: snippet
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language: python
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tags: [dictionary,list]
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cover: digital-nomad-2
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dateModified: 2020-10-28T12:21:39+02:00
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---
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Retrieves the value of the nested key indicated by the given selector list from a dictionary or list.
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- Use `functools.reduce()` to iterate over the `selectors` list.
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- Apply `operator.getitem()` for each key in `selectors`, retrieving the value to be used as the iteratee for the next iteration.
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```py
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from functools import reduce
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from operator import getitem
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def get(d, selectors):
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return reduce(getitem, selectors, d)
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```
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```py
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users = {
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'freddy': {
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'name': {
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'first': 'fred',
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'last': 'smith'
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},
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'postIds': [1, 2, 3]
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}
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}
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get(users, ['freddy', 'name', 'last']) # 'smith'
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get(users, ['freddy', 'postIds', 1]) # 2
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```
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