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python/snippets/has-duplicates.md

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+---
+title: Check for duplicates in list
+type: snippet
+tags: [list]
+cover: jars-on-shelf-2
+dateModified: 2020-11-02T19:28:05+02:00
+---
+
+Checks if there are duplicate values in a flat list.
+
+- Use `set()` on the given list to remove duplicates, compare its length with the length of the list.
+
+```py
+def has_duplicates(lst):
+  return len(lst) != len(set(lst))
+```
+
+```py
+x = [1, 2, 3, 4, 5, 5]
+y = [1, 2, 3, 4, 5]
+has_duplicates(x) # True
+has_duplicates(y) # False
+```