YouTube Link: https://youtu.be/RQRCWDK9UkA ** Python Certification Training: https://www.edureka.co/python ** This Edureka PPT on 'Python Lambda' is to educate you about the Lambda functions of Python and help you understand how to use them in various scenarios. Below are the topics covered in this PPT: What are Python Lambda functions? Why are they used? How to write anonymous functions? Lambda functions within user-defined functions Using Anonymous functions within - filter() - map() - reduce() Solving algebric expressions using Lambda 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

2. ❖ What are Python Lambda functions?
❖ Why are they used?
❖ How to write Anonymous functions?
❖ Lambda functions within user defined functions
• filter()
• map()
❖ Using Anonymous functions within
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• reduce()
❖Solving Algebraic expressions using Lambda

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PythonLambda Functionsare:
• Anonymousornameless functions
• ‘lambda’isnotaname,butitsakeyword
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6. Also known as throw-
away functions as they
are needed just once
They are also passed
as inputs or returned
as outputs of other
higher-order functions
The body of Lambda
functions is written in
a single line
One-time use I/O of other functions Reduce code size
Why are they used?
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8. A Lambda function is created using the lambda
operator
lambda arguments: expression
lambda : “Specify the purpose”
lambda a1…n: “Specify use of a1…n“
lambda a1: “Specify use of a1“
SYNTAX:
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10. Lambda functions are best used within other higher-
order functions
Anonymous functions within
user defined functions
def new_func(x):
return(lambda y: x+y)
t=new_func(3)
u=new_func(2)
print(t(3))
print(u(3))
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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.
my_list = [2,3,4,5,6,7,8]
new_list = list(filter(lambda a: (a/3 == 2), my_list))
print(new_list)
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13. map():
Applies a given function to all the iterables and returns a
new list.
my_list = [2,3,4,5,6,7,8]
new_list = list(map(lambda a: (a/3 != 2), li))
print(new_list)
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14. reduce():
Applies some other function to a list of elements that are
passed as a parameter to it and finally returns a single
value.
from functools import reduce
reduce(lambda a,b: a+b, [23,21,45,98])
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16. Copyright © 2017, edureka and/or its affiliates. All rights reserved.
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