How to use Map() Filter() and Reduce() functions in Python | Edureka
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The document provides an introduction to three essential functions in Python: map(), filter(), and reduce(). The map() function applies a specified function to all elements in an iterable and returns a new list, filter() filters elements based on a condition, and reduce() accumulates values from an iterable into a single result. It also discusses how these functions can be combined to process data efficiently.
![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](https://image.slidesharecdn.com/mapfilterreduce-191209060018/85/How-to-use-Map-Filter-and-Reduce-functions-in-Python-Edureka-6-320.jpg)
![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](https://image.slidesharecdn.com/mapfilterreduce-191209060018/85/How-to-use-Map-Filter-and-Reduce-functions-in-Python-Edureka-7-320.jpg)
![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](https://image.slidesharecdn.com/mapfilterreduce-191209060018/85/How-to-use-Map-Filter-and-Reduce-functions-in-Python-Edureka-8-320.jpg)
![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](https://image.slidesharecdn.com/mapfilterreduce-191209060018/85/How-to-use-Map-Filter-and-Reduce-functions-in-Python-Edureka-10-320.jpg)
![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](https://image.slidesharecdn.com/mapfilterreduce-191209060018/85/How-to-use-Map-Filter-and-Reduce-functions-in-Python-Edureka-11-320.jpg)
![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](https://image.slidesharecdn.com/mapfilterreduce-191209060018/85/How-to-use-Map-Filter-and-Reduce-functions-in-Python-Edureka-12-320.jpg)
![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](https://image.slidesharecdn.com/mapfilterreduce-191209060018/85/How-to-use-Map-Filter-and-Reduce-functions-in-Python-Edureka-14-320.jpg)
![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](https://image.slidesharecdn.com/mapfilterreduce-191209060018/85/How-to-use-Map-Filter-and-Reduce-functions-in-Python-Edureka-15-320.jpg)
![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](https://image.slidesharecdn.com/mapfilterreduce-191209060018/85/How-to-use-Map-Filter-and-Reduce-functions-in-Python-Edureka-16-320.jpg)
![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](https://image.slidesharecdn.com/mapfilterreduce-191209060018/85/How-to-use-Map-Filter-and-Reduce-functions-in-Python-Edureka-17-320.jpg)
![,( ) )
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.](https://image.slidesharecdn.com/mapfilterreduce-191209060018/85/How-to-use-Map-Filter-and-Reduce-functions-in-Python-Edureka-22-320.jpg)
How to use Map() Filter() and Reduce() functions in Python | Edureka
- 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
- 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
- 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
- 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
- 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.
- 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
- 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