# Fonction calculate_average
def calculate_average(list):
    """Returns average of a given list"""
    total = 0
    for i in list:
        total += i
    return total / len(list)

# Exemple d'utilisation de la fonction
numbers = [10, 20, 30, 40, 50]
average = calculate_average(numbers)
print("La moyenne est :", average)