Test if every list element is falsy
![](/assets/cover/jars-on-shelf-2-800.webp)
Checks if the provided function returns True
for at least one element in the list.
- Use
all()
andfn
to check iffn
returnsFalse
for all the elements in the list.
def none(lst, fn = lambda x: x): return all(not fn(x) for x in lst) none([0, 1, 2, 0], lambda x: x >= 2 ) # False none([0, 0, 0]) # True