3.20作业

# 1、函数对象优化多分支if的代码练熟
# def login():
#     print('登录功能')
#
# def transfer():
#     print('转账功能')
#
# def check_balance():
#     print('查询余额')
# def withdraw():
#     print('提现')
# def register():
#     print('注册')
#
# func_dic={ '0':['退出',None],
#            '1':['登录',login],
#            '2':['转账',transfer],
#            '3':['查询',check_balance],
#            '4':['提现',withdraw],
#            '5':['注册',register]
# }
# while True:
#     for i in func_dic:
#         print(i,func_dic[i][0])
#     choice=input('请输入命令：')
#     if not choice.isdigit():
#         print('必须输入数字')
#         continue
#     if choice==0:
#         break
#     if choice in func_dic:
#         func_dic[choice][1]()
#     else:
#         print('指令不存在')









# 2、编写计数器功能，要求调用一次在原有的基础上加一
# 温馨提示：
# I: 需要用到的知识点：闭包函数 +
# nonlocal
# II: 核心功能如下：
#
# def counter():
#     x += 1
#     return x
#
#
# 要求最终效果类似
# print(couter())  # 1
# print(couter())  # 2
# print(couter())  # 3
# print(couter())  # 4
# print(couter())  # 5


def func():
    x=0
    def counter():
        nonlocal x
        x+=1
        return x
    return counter

counter=func()
print(counter())
print(counter())
print(counter())
print(counter())
print(counter())