19 lines
449 B
Markdown
19 lines
449 B
Markdown
---
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title: none
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tags: list,function,intermediate
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---
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Returns `False` if the provided function returns `True` for at least one element in the list, `True` otherwise.
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Use `all()` in combination with `map()` and `fn` to check if `fn` returns `False` for all the elements in the list.
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```py
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def none(lst, fn=lambda x: x):
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return all(map(lambda x: not fn(x), lst))
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```
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```py
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none([0, 1, 2, 0], lambda x: x >= 2 ) # False
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none([0, 0, 0]) # True
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```
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