Python Filter Function
Table Of Contents:
- What Is A Filter Function?
- Syntax Of Filter Function.
- Examples Of Filter Function.
(1) What Is A Filter Function?
- Python filter( ) method is an inbuilt method, which is used to filter out the required values from an iterable like(a list, tuple, set, or dictionary).
- The filter( ) method will return an iterator that you can easily convert iterators to sequences like lists, tuples, strings etc.
(2) Syntax Of Filter Function.
filter(function, iterable)Filter Parameters:
- function: A Function to be run for each item in the iterable
- iterable: The iterable to be filtered.
Filter Return Type:
- The filter( ) function returns an iterator like (list, tuple, set, dictionary.)
(3) Examples Of Filter Function.
Example-1:Filtering The Even Numbers
numbers = [1,2,3,4,5,6,7,8,9,10]
def even(n):
if n % 2 == 0:
return n
filtering = filter(func,numbers)
even = list(filtering)
print(even)Output:
[2, 4, 6, 8, 10]Example-2: Filtering Numbers Greater Than 5.
numbers = [2,4,5,6,9,5,4,10,15,99]
def greater(n):
if n > 5:
return n
filtered = filter(greater,numbers)
numbers = list(filtered)
print(numbers)Output:
[6, 9, 10, 15, 99]Example-3: Filtering Numbers From Mixed List.
numbers = [1,'a',2,'e',3,'i',4,'o',5]
def number(n):
if type(n) == int:
return n
filtered = filter(number,numbers)
numbers = list(filtered)
print(numbers)Output:
[1, 2, 3, 4, 5]