函数对象和闭包作业

1、函数对象优化多分支if的代码练熟

def log_in():
    print('登录功能')

def register():
    print('注册功能')

def check_balance():
    print('查询余额')

def withdraw():
    print('提现')

def transfer():
    print('转账')

dic = {
    '0':{'退出',exit},
    '1':{'注册',register},
    '2':{'登录',log_in},
    '3':{'查询余额',check_balance},
    '4':{'提现',withdraw},
    '5':{'转账',transfer}
}
while True:
    for k in dic:
        print(k,dic[k][0])
    cmd = input('请输入命令编号:').strip()
    if not cmd.isdigit():
        print('必须输入命令编号的数字，傻叉')
        continue
    if cmd == '0':
        break
    if cmd in dic:
        dic[cmd][1](name)
    else:
        print('没有此命令')

计算器累加

def f1():
    x=0
    def counter():
        nonlocal x
        x += 1
        return x
    return counter
f2 = f1()
print(f2())
print(f2())
print(f2())
print(f2())
print(f2())