20.03.19作业

作业要求：下述所有代码画图以及分析代码执行流程

1、以定义阶段为准，先画出名称空间的嵌套关系图

2、然后找到调用函数的位置，写出函数调用时代码的执行过程，涉及到名字的查找时，参照1中画好

的嵌套图，标明查找顺序，一层一层直到找到位置

===================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=111
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()

===================题目八===================

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
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(): username = input('请输入用户名: ').strip() password = input('请输入密码: ').strip() if username == 'tank' and password == '123': global login_user login_user = username print('登录成功!') else: print('登录失败!') def check_money(username): if login_user == None: login() dic = {} with open('db3.txt', 'r', encoding='utf-8') as f: for line in f: user, money = line.strip().split(':') dic[user] = int(money) if username not in dic: return return dic.get(username) while 1: username = input('name') print(check_money(username))