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python/snippets/none.md

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+---
+title: Test if every list element is falsy
+type: snippet
+tags: [list]
+cover: jars-on-shelf-2
+dateModified: 2020-11-02T19:28:27+02:00
+---
+
+Checks if the provided function returns `True` for at least one element in the list.
+
+- Use `all()` and `fn` to check if `fn` returns `False` for all the elements in the list.
+
+```py
+def none(lst, fn = lambda x: x):
+  return all(not fn(x) for x in lst)
+```
+
+```py
+none([0, 1, 2, 0], lambda x: x >= 2 ) # False
+none([0, 0, 0]) # True
+```