26 lines
511 B
Markdown
26 lines
511 B
Markdown
---
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title: Check if list has no duplicates
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type: snippet
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language: python
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tags: [list]
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cover: touch-flower
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dateModified: 2021-01-07T23:30:28+02:00
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---
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Checks if all the values in a list are unique.
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- Use `set()` on the given list to keep only unique occurrences.
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- Use `len()` to compare the length of the unique values to the original list.
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```py
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def all_unique(lst):
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return len(lst) == len(set(lst))
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```
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```py
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x = [1, 2, 3, 4, 5, 6]
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y = [1, 2, 2, 3, 4, 5]
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all_unique(x) # True
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all_unique(y) # False
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```
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