Python3 Lambda Function

Python Lambda Function

Anonymous/Lambda Function :

In Python, anonymous function is a function that is defined without a name.

While normal functions are defined using the def keyword, in Python anonymous functions are defined using the lambda keyword.

Lambda functions are used extensively along with built-in functions like filter(),map(),reduce() .

Syntax:

lambda arguments: expression

Example

double=lambda x: x*2

print(double(5))

output: 10

def double(x):
return x*2

print(double(5))

output: 10

#example using filter() function
lst=[1,2,3,4,5]
even_lst=list(filter(lambda x: (x%2==0),lst))
print(even_lst)

output: [2,4]

#example using map() function
lst=[1,2,3,4,5]
new_lst=list(map(lambda x: (x+2),lst))
print(new_lst)

output: [3,4,5,6,7]

#example using reduce() function

from functools import reduce

lst=[1,2,3,4,5]
new_lst=list(reduce(lambda x,y: x*y ,lst))
print(new_lst)

output: 120

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