20 lines
377 B
Markdown
20 lines
377 B
Markdown
---
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title: Flatten list
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tags: list,intermediate
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firstSeen: 2019-09-19T15:46:10+03:00
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lastUpdated: 2020-11-02T19:27:53+02:00
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---
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Flattens a list of lists once.
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- Use a list comprehension to extract each value from sub-lists in order.
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```py
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def flatten(lst):
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return [x for y in lst for x in y]
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```
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```py
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flatten([[1, 2, 3, 4], [5, 6, 7, 8]]) # [1, 2, 3, 4, 5, 6, 7, 8]
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```
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