Python Program to Check If a List is Empty

The provided Python program is designed to check whether a given list is empty or not. The core logic is encapsulated within the is_list_empty function, which takes a list as its parameter. Inside the function, the bool() function is used to convert the given list into a boolean value. If the list is empty, the boolean value becomes False, and the not operator is applied to yield True. Conversely, if the list is not empty, the boolean value is True, and the function returns False. This way, the function provides a clear and concise assessment of whether the input list is empty or contains elements. The program includes an example usage section where an empty list, my_list, is checked using the is_list_empty function, and a corresponding message is printed based on the result.

Source code

# Function to check if a list is empty
def is_list_empty(lst):
    return not bool(lst)

# Example usage
my_list = []  # an empty list
if is_list_empty(my_list):
    print("The list is empty.")
else:
    print("The list is not empty.")

Description

Certainly! Here’s a step-by-step breakdown of the provided Python program to check if a list is empty:

1. Define a Function:def is_list_empty(lst):
   • The program starts by defining a function named is_list_empty that takes a single parameter, lst, which is expected to be a list.
2. Use bool() Function:return not bool(lst)
   • The function uses the bool() function to convert the input list, lst, into a boolean value.
   • If the list is empty, the boolean value becomes False.
   • The not operator is then applied to the boolean value, flipping it to True for an empty list.
   • If the list is not empty, the boolean value is True, and not makes it False.
3. Example Usage:my_list = [] # an empty list if is_list_empty(my_list): print("The list is empty.") else: print("The list is not empty.")
   • An example list, my_list, is created and initialized as an empty list.
   • The is_list_empty function is called with my_list as an argument.
   • The result is then checked using an if-else statement.
   • If the list is empty, it prints “The list is empty.” Otherwise, it prints “The list is not empty.”
4. Output:
   • The program’s output will depend on the content of the my_list variable. In this case, since my_list is an empty list, the output will be “The list is empty.”

This program encapsulates the logic of checking whether a list is empty within a reusable function, making it easy to integrate into other parts of your code.

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