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snippets/python/s/all-unique.md

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