# Python – Lambda Function to Check if value is in a List

Given a list, the task is to write a Python program to check if the value exists in the list or not using the lambda function.

Example:

Input  :  L = [1, 2, 3, 4, 5]
element = 4
Output :  Element is Present in the list

Input  :  L = [1, 2, 3, 4, 5]
element = 8
Output :  Element is NOT Present in the list

We can achieve the above functionality using the following two methods.

## Method 1: Using Lambda and Count() method

Define a list with integers. Define a lambda function such that it takes array and value as arguments and return the count of value in list.

lambda v:l.count(v)

If the count is zero then print the Element is not present else print element is NOT present.

## Python3

 arr = [1, 2, 3, 4] v = 3    def x(arr, v): return arr.count(v)       if(x(arr, v)):     print("Element is Present in the list") else:     print("Element is Not Present in the list")

Output:

Element is Present in the list

Explanation:  The arr and v are passed to the lambda function and it evaluates the count of v in the arr and here v = 3 and it is present 1 time in the array and the if condition is satisfied and prints the element Is present in the list.

## Method 2: Using Lambda and in keyword

Define a list with integers. Define a lambda function such that it takes array and value as arguments and check if value is present in array using in keyword

lambda v: True if v in l else False

If the lambda return True then print the Element is present else print element is NOT present.

## Python3

 arr=[1,2,3,4] v=8 x=lambda arr,v: True if v in arr else False    if(x(arr,v)):   print("Element is Present in the list") else:   print("Element is Not Present in the list")

Output:

Element is Not Present in the list

Explanation:  The arr and v are passed to the lambda function and it checks if the value is present in an array using IN keyword and here v = 8 and it is NOT Present in the array and returns false so prints the element Is NOT present in the list.

Whether you're preparing for your first job interview or aiming to upskill in this ever-evolving tech landscape, GeeksforGeeks Courses are your key to success. We provide top-quality content at affordable prices, all geared towards accelerating your growth in a time-bound manner. Join the millions we've already empowered, and we're here to do the same for you. Don't miss out - check it out now!