Home » Python

Python reduce() with Lambda Function

Python reduce() with lambda function: In this tutorial, we will learn how to use the reduce() function with lambda function. By Pankaj Singh Last updated : December 30, 2023

Python reduce() with Lambda Function

The reduce() function applies on each element of an iterable collection and returns the reduced (based on applied calculation through the function) value.

The lambda function is an anonymous function - that means the function which does not have any name.

Implementing reduce() with lambda function

Give a list of numbers and we have to find their sum using lambda and reduce() function.

Approach 1: Using normal way

# function to find sum of the elements
def add(data):
    s=0
    for n in data:
        s=s+n
    return s

# list of the values 
fibo=[0,1,1,2,3,5,8,13,21,34,55]
print("Orignal List  :",fibo)

# function call
s=add(fibo)
print("Sum = ",s)

Output

Orignal List  : [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55]
Sum =  143

Approach 2: Using reduce() with lambda

from functools import reduce

def add(data):
    s=0
    for n in data:
        s=s+n
    return s

# list of integers	
fibo=[0,1,1,2,3,5,8,13,21,34,55]
print("Orignal List  :",fibo)

# using reduce and lambda
s=reduce(lambda a,b:a+b,fibo)
print("Sum = ",s)

Output

Orignal List  : [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55]
Sum =  143

Python Tutorial