Youtube Link: https://youtu.be/QxpbE5hDPws ** Python Certification Training: https://www.edureka.co/data-science-python-certification-course** This Edureka PPT on 'map, filter, and reduce functions in Python' is to educate you about these very important built-in functions in Python. Below are the topics covered in this PPT: Introduction to map filter reduce The map() function The filter() function The reduce() function Using map(),filter() and reduce() functions together filter() within map() map() within filter() map() and filter() within reduce() Follow us to never miss an update in the future. YouTube: https://www.youtube.com/user/edurekaIN Instagram: https://www.instagram.com/edureka_learning/ Facebook: https://www.facebook.com/edurekaIN/ Twitter: https://twitter.com/edurekain LinkedIn: https://www.linkedin.com/company/edureka Castbox: https://castbox.fm/networks/505?country=in

1. Copyright © 2017, edureka and/or its affiliates. All rights reserved.

2. ➢ Introduction to map() filter() reduce()
▪ The map() function
▪ The filter() function
▪ The reduce() function
➢ Using map() filter() and reduce() together
www.edureka.co/python
▪ filter() within map()
▪ map() within filter()
▪ filter() and map() within reduce()

3. Introduction to map(), filter() and
reduce()
www.edureka.co/python

4. Applies a given
function to all the
iterables and returns
a new list
Creates an output list
consisting of values for
which the function
returns true
Applies a given
function to the
iterables and returns a
single value
map() filter() reduce()
Introduction to map(), filter() and reduce()
www.edureka.co/python

5. www.edureka.co/python

6. 1 2 3 4
map():
Applies a given function to all the iterables and returns a
new list.
output = map(lambda x: x+3 , [1,2,3,4])
www.edureka.co/python

7. 1 2 3 4
map():
Applies a given function to all the iterables and returns a
new list.
output = map(lambda x: x+3 , [1,2,3,4])
www.edureka.co/python

8. 1 2 3 4
4 5 6 7
map():
Applies a given function to all the iterables and returns a
new list.
output = map(lambda x: x+3 , [1,2,3,4])
www.edureka.co/python

9. www.edureka.co/python

10. filter()
Used to filter the given iterables(lists, sets, etc) with the help
of another function passed as an argument to test all the
elements to be true or false.
output = map(lambda x: (x>=3) , [1,2,3,4])
1 2 3 4
www.edureka.co/python

11. filter()
Used to filter the given iterables(lists, sets, etc) with the help
of another function passed as an argument to test all the
elements to be true or false.
output = map(lambda x: (x>=3) , [1,2,3,4])
1 2 3 4
www.edureka.co/python

12. filter()
Used to filter the given iterables(lists, sets, etc) with the help
of another function passed as an argument to test all the
elements to be true or false.
output = map(lambda x: (x>=3) , [1,2,3,4])
1 2 3 4
3 4
www.edureka.co/python

13. www.edureka.co/python

14. output = map(lambda x,y: x+y, [1,2,3,4])
reduce():
Applies some other function to a list of elements that are
passed as a parameter to it and finally returns a single
value.
1 2 3 4

15. output = map(lambda x,y: x+y, [1,2,3,4])
reduce():
Applies some other function to a list of elements that are
passed as a parameter to it and finally returns a single
value.
1 2 3 4
3
www.edureka.co/python

16. output = map(lambda x,y: x+y, [1,2,3,4])
reduce():
Applies some other function to a list of elements that are
passed as a parameter to it and finally returns a single
value.
1 2 3 4
3
6
www.edureka.co/python

17. output = map(lambda x,y: x+y, [1,2,3,4])
reduce():
Applies some other function to a list of elements that are
passed as a parameter to it and finally returns a single
value.
1 2 3 4
3
6
10
www.edureka.co/python

18. www.edureka.co/python

20. c = map(lambda x:x+x, )filter(lambda x: (x>=3), (1,2,3,4))
www.edureka.co/python

21. 1 2 3 4
3 443
filter(lambda x: (x>=3), (1,2,3,4))
c = map(lambda x:x+x, )
www.edureka.co/python

22. ,( ) )
1 2 3 4
3 4
43c = map(lambda x:x+x,
filter(lambda x: (x>=3), (1,2,3,4))
www.edureka.co/python
Filters out integers >=3 resulting in [3,4], then maps this using (x+x)
condition, you will get [6,8], which is the output.

23. www.edureka.co/python

24. c = filter(lambda x: (x>=3), )map(lambda x:x+x, (1,2,3,4))
www.edureka.co/python

25. c = filter(lambda x: (x>=3), )
map(lambda x:x+x, (1,2,3,4))
2 3 4
5 6 7
1
4
www.edureka.co/python

26. map(lambda x:x+x, (1,2,3,4))
1 2 3 4
c = filter(lambda x: (x>=3), )4 5 6 7( )), , ,
www.edureka.co/python

27. www.edureka.co/python

28. d = reduce ( lambda x, y: x+y, )map ( lambda x:x+x, filter ( lambda x: (x>=3) , (1,2,3,4)))
www.edureka.co/python

29. d = reduce ( lambda x, y: x+y, )
map ( lambda x:x+x, filter ( lambda x: (x>=3) , (1,2,3,4)))
1 2 3 4
3 443
86
www.edureka.co/python

30. d = reduce ( lambda x, y: x+y,
)
map ( lambda x:x+x, filter ( lambda x: (x>=3) , (1,2,3,4)))
1 2 3 4
3 443
86( , ))
www.edureka.co/python

31. Copyright © 2017, edureka and/or its affiliates. All rights reserved.
www.edureka.co

32. www.edureka.co/python