Filter Function In Python

filter function expects two arguments, function_object and an iterable. function_object returns a boolean value. function_object is called for each element of the iterable and filter returns only those element for which the function_object returns true.

Like map function, filter function also returns a list of that element. Unlike mapfunction filter function can only have one iterable as input.

Basic syntax:

filter(function_object, iterable)

For Example:

Even number using filter function

a = [1, 2, 3, 4, 5, 6]
filter(lambda x : x % 2 == 0, a) 

Output:

[2, 4, 6]