名称空间作业

# ===================题目一===================
input=333
def func():
    input=444
func()
print(input)

# ===================题目二===================
def func():
    print(x)
x=111
func()

# ===================题目三===================
x=1
def func():
   print(x)

def foo():
    x=222
    func()
foo()

# ===================题目四===================
input=333
def f1():
    def f2():
        # input=333
        print(input)
    input=222

    f2()

f1()

# ===================题目五===================
x=111
def func():
    print(x)
    x=222
func()

# ===================题目六===================
x=111

def foo():
    print(x,)

def bar():
    print(x)
foo()
bar()

# ===================题目七===================
x=1
def func2():
    func1()

x=2
def func1():
    print(x)

x=3

func2()

# 1、如下全局变量记录了当前登录用户，编写登录功能，一旦用户登录成功，则将全局变量赋值为当前登录的用户名

login_user=None
def login():
    inp_user = input('用户名：').strip()
    inp_pwd = input('密码：').strip()
    if inp_user == 'qqq' and inp_pwd == '123':
        print("登录成功")
        global login_user
        login_user = inp_user
    else:
        print("登录失败")
login()
print(login_user)

2、针对之前编写的查询余额的功能，添加额外的逻辑：如果用户没有登录，则先执行登录功能

login_user = None
def login():
    inp_user = input('用户名：').strip()
    inp_pwd = input('密码：').strip()
    if inp_user == 'qqq' and inp_pwd == '123':
        print("登录成功")
        global login_user
        login_user = inp_user
    else:
        print("登录失败")


def balance(login_user):
    if login_user is None:
        print("请先登录")
        login()
    else:
        with open('b.txt', 'rt', encoding='utf-8')as f:
            for i in f:
                name, money = i.strip().split(':')
                if login_user == name:
                    print('您的余额为:{}'.format(money))
                    break