25 lines
544 B
Markdown
25 lines
544 B
Markdown
---
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title: Spread list
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tags: list
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expertise: intermediate
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cover: blog_images/digital-nomad-14.jpg
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firstSeen: 2018-01-08T22:38:05+02:00
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lastUpdated: 2020-09-15T16:13:06+03:00
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---
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Flattens a list, by spreading its elements into a new list.
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- Loop over elements, use `list.extend()` if the element is a list, `list.append()` otherwise.
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```py
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def spread(arg):
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ret = []
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for i in arg:
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ret.extend(i) if isinstance(i, list) else ret.append(i)
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return ret
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```
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```py
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spread([1, 2, 3, [4, 5, 6], [7], 8, 9]) # [1, 2, 3, 4, 5, 6, 7, 8, 9]
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```
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