How to Check if Element Exists in List in Python

Submitted by razormist on Friday, May 24, 2024 - 23:48.

In this tutorial, we will program 'How to Check if an Element Exists in a List in Python'. We will learn how to identify if a specific element is present in a list. The objective is to enable you to efficiently check for the existence of elements within a list. I will provide a sample program to demonstrate the actual coding of this tutorial.

This topic is very easy to understand; just follow the instructions I provide, and you can also do it yourself with ease. The program I will show you covers the basics of programming for finding a missing element in a list. I will do my best to provide you with the easiest way for checking the list. So, let's start with the coding.

Getting Started:

First you will have to download & install the Python IDLE's, here's the link for the Integrated Development And Learning Environment for Python https://www.python.org/downloads/.

Creating Main Function

This is the main function of the application. The following code will display a simple GUI in terminal console that will display program. To do this, simply copy and paste these blocks of code into the IDLE text editor.

lst=[ 1, 6, 3, 5, 3, 4 ] 
 
 
ret = False
 
while True:
    print("\n================== Check if Element Exists in List ==================\n\n")
 
 
    i=int(input("Enter a number: ")) 
 
    if i in lst: 
       print("The number you entered is already exist!") 
    else: 
        print("The number you entered is currently not exist!")
 
 
    opt = input("\nDo you want to try again?(yes/no): ")
 
    if opt.lower() == 'yes':
        ret=False
    elif opt.lower() == 'no':
        ret=True
        print("Exiting program....")
 
    else:
        print("Please enter yes/no:")
        break
 
    if ret == False:
        continue

This Python script checks if a user-provided number exists in a predefined list. It repeatedly prompts the user to enter a number and then checks if that number is present in the list lst. It prints a message indicating whether the number exists in the list. After each check, it asks the user if they want to try again or exit the program.

Output:

The How to Check if Element Exists in List in Python source code that I provide can be download below. Please kindly click the download button.

There you have it we successfully created How to Check if Element Exists in List in Python. I hope that this simple tutorial help you to what you are looking for. For more updates and tutorials just kindly visit this site. Enjoy Coding!

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