总额和平均值

本课属于 Coddy Python 学习旅程的“基础知识”单元。第 72 课，共 77 课。

挑战

简单

处理计算总支出和平均支出的选项（3）。

如果支出列表为空，输出：

No expenses recorded yet.

否则，按以下格式输出列表：

Total expense: 600.0
Average expense: 200.0

假设之前输入的支出是 300、200 和 100。（按此顺序！）

亲手试试

print("Welcome to the Daily Expense Tracker!")

# Display menu once
print("\nMenu:")
print("1. Add a new expense")
print("2. View all expenses")
print("3. Calculate total and average expense")
print("4. Clear all expenses")
print("5. Exit")

# Initialize an empty list to store expenses
expenses = []

while True:
    # Get user choice
    choice = input()
    
    if choice == "1":
        # Add a new expense
        amount = float(input())
        expenses.append(amount)
        print("Expense added successfully!")

    elif choice == "2":
        # View all expenses
        if len(expenses) == 0:
            print("No expenses recorded yet.")
        else:
            print("Your expenses:")
            for i in range(len(expenses)):
                print(f"{i + 1}. {expenses[i]}")

    elif choice == "5":
        # Exit the program
        print("Exiting the Daily Expense Tracker. Goodbye!")
        break