filter
Select the items of an iterable for which a function returns a truthy value.
Python 3.13
filter(function, iterable)- function
- A condition function that receives an item; with None, truthy items are selected.Callable | None
- iterable
- The items to select from.Iterable
Return value
An iterator of matching items; wrap it in list() to get a list.
Examples
Keeping numbers greater than two
Python 3.13
print(list(filter(lambda x: x > 2, [1, 2, 3, 4])))[3, 4]
Keeping truthy values
Python 3.13
print(list(filter(None, [0, 1, '', 'a', None])))[1, 'a']
Details
Items are checked only when the result is iterated over.