---
title: none
tags: list,intermediate
---

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
```