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() in combination with map() and fn to check if fn returns False for all the elements in the list.

def none(lst, fn=lambda x: x):
  return all(map(lambda x: not fn(x), lst))

none([0, 1, 2, 0], lambda x: x >= 2 ) # False
none([0, 0, 0]) # True