30-seconds-of-code/snippets/none.md

title, tags

title	tags
none	list,function,intermediate

Returns False if the provided function returns True for at least one element in the list, True otherwise.

• Use all() and fn to check if fn returns False 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