Python list empty check using Boolean logic

Last update on April 23 2025 12:51:26 (UTC/GMT +8 hours)

4. List Emptiness Checker

Write a Python function that checks if a given list is empty or not using boolean logic.

Sample Solution:

Code:

def is_empty_list(lst):
    return not bool(lst)

def main():
    try:
        input_list = eval(input("Input a list (e.g., [1, 2, 3, 4]): "))
        
        if isinstance(input_list, list):
            if is_empty_list(input_list):
                print("The list is empty.")
            else:
                print("The list is not empty.")
        else:
            print("Invalid input. Please enter a valid list.")
    except Exception as e:
        print("An error occurred:", e)

if __name__ == "__main__":
    main()

Output:

Input a list (e.g., [1, 2, 3, 4]): [1,2,3]
The list is not empty.

Input a list (e.g., [1, 2, 3, 4]): []
The list is empty.

In the above exercise the program prompts the user to input a list (using eval to convert the input string to a list), and then uses the "is_empty_list()" function to determine if the list is empty or not. Based on the results, it prints the appropriate message.

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to determine if a list is empty by checking its truth value and print a corresponding message.
Write a Python function that returns True if a given list is empty, and False otherwise, without using len().
Write a Python script to check multiple lists for emptiness using boolean logic and then count how many of them are non-empty.
Write a Python program to evaluate a list's emptiness using a conditional expression and print either "List is empty" or "List has elements."

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