18 lines
285 B
Markdown
18 lines
285 B
Markdown
---
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title: union
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tags: list,beginner
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---
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Returns every element that exists in any of the two lists once.
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- Create a `set` with all values of `a` and `b` and convert to a `list`.
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```py
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def union(a, b):
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return list(set(a + b))
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```
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```py
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union([1, 2, 3], [4, 3, 2]) # [1,2,3,4]
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```
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