This Python function, calculate_average, computes the average of a list of numbers. It first checks if the list is empty. If the list contains numbers, it calculates the average by dividing the sum of the numbers, found using the built-in sum() function, by the count of the numbers, determined by the len() function. To prevent a ZeroDivisionError, the function returns 0 if the input list is empty.

def calculate_average(numbers):
    """
    Calculates the average of a list of numbers.
    Returns 0 if the list is empty.
    """
    if numbers: # Check if the list is not empty
        return sum(numbers) / len(numbers)
    else:
        return 0

# Example 1: Non-empty list
my_numbers = [10, 20, 30, 40, 50]
average = calculate_average(my_numbers)
print(f"The average is: {average}")
# Expected Output: The average is: 30.0

# Example 2: Empty list
empty_list = []
average_empty = calculate_average(empty_list)
print(f"The average of an empty list is: {average_empty}")
# Expected Output: The average of an empty list is: 0