用 python 函数做出一个简单小应用

学了几周的 Python，今天参考老师的教程，成功做出一个简单的“银行存取款系统”，算是一个小小的里程碑，很有成就感，以下是代码：

balance = 1000
account_log = []

def valideate(func):
    def wrapper(*args,**kwargs):
        amount = str(args[0])
        index = amount.index(".")
        if len(amount) - index - 1 > 1:
            print("输入格式有误，小数点最多保留两位")
        else:
             func(*args,**kwargs)
    return wrapper

@valideate
def deposit(amount):
    """
    存款操作
    :param amount:存入金额
    :return:None
    """
    global balance
    balance += amount
    write_log(amount,"存入")

@valideate
def withdrawal(amount):
    """
    取款
    :param amount: 金额
    :return: None
    """
    global balance
    if amount > balance:
        print("余额不足")
    else:
        balance -= amount
    write_log(amount,"取出")

def write_log(amount,type):
    """
    写入日志
    :param amount: 金额
    :param type: 存入或取出
    :return:None
    """
    now = datetime.datetime.now()
    create_time = now.strftime("%Y-%m-%d %M:%H:%S")
    data = [create_time,type,amount,f"{balance:.2f}"]
    account_log.append(data)


def print_log():
    """
    查看流水
    :return:None
    """
    print(account_log)

def show_menu():
    menu = """
操作菜单：
0：退出；
1:存款；
2：取款；
3：查看记录；
    """
    print(menu)

while True:
    show_menu()
    num = int(input("请根据菜单编号输入："))
    if num == 0:
        print("你已退出系统")
        break
    elif num == 1:
        print("存款")
        amount = float(input("请输入存款金额:"))
        deposit(amount)
        print(f"当前余额是{balance:.2f}")

    elif num == 2:
        print("取款")
        amount = float(input("请输入取款金额:"))
        withdrawal(amount)
        print(f"当前余额是{balance:.2f}")

    elif num == 3:
        print("查看记录")
        print_log()
    else:
        print("输入有误")

以下是输出结果：

输入相关数字，即可查看相应结果。

本文地址：https://blog.csdn.net/weixin_47385862/article/details/110247739