26 lines
581 B
Markdown
26 lines
581 B
Markdown
---
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title: Deep flatten list
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type: snippet
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tags: [list,recursion]
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cover: mask-quiet
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dateModified: 2020-12-29T19:53:45+02:00
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---
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Deep flattens a list.
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- Use recursion.
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- Use `isinstance()` with `collections.abc.Iterable` to check if an element is iterable.
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- If it is iterable, apply `deep_flatten()` recursively, otherwise return `[lst]`.
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```py
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from collections.abc import Iterable
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def deep_flatten(lst):
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return ([a for i in lst for a in
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deep_flatten(i)] if isinstance(lst, Iterable) else [lst])
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```
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```py
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deep_flatten([1, [2], [[3], 4], 5]) # [1, 2, 3, 4, 5]
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```
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