The filter function
The filter function filters the elements of an iterable object, leaving only those that match a certain condition. The first parameter specifies the callback function by which the object will be filtered. The second parameter specifies the object itself for filtering.
Only those elements remain in the object for which the callback returns True.
The function returns a special iterable object as its result. It can be converted to a list using the list function.
Syntax
filter(function, object for filtering)
Example
Let's filter the original list to get a list consisting of only even elements:
lst = [2, 3, 6, 8, 15]
res = filter(lambda x: x % 2 == 0, lst)
print(list(res))
Result of code execution:
[2, 6, 8]
Example
Now let's filter out only the odd elements:
lst = [2, 3, 6, 8, 15]
res = filter(lambda x: x % 2 != 0, lst)
print(list(res))
Result of code execution:
[3, 15]
