1 九九乘法表

<pre style="margin: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-family: 'Courier New' !important; font-size: 12px !important;">for i in range(9):#从0循环到8
    i += 1#等价于 i = i+1
    for j in range(i):#从0循环到i
        j += 1
        print(j,'*',i,'=',i*j,end = ' ',sep='') # end默认在结尾输出换行，将它改成空格 sep 默认 j,'*',i,'=',i*j 各元素输出中间会有空格
    print()#这里作用是输出换行符</pre>

<pre style="margin: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-family: 'Courier New' !important; font-size: 12px !important;">i = 1
while i <= 9:
    j = 1
    while j <= i: print("%d*%d=%d" % (j,i,i*j),end=' ') # 格式化输出
        j += 1 i += 1
    print()</pre>

2 登录程序

<pre style="margin: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-family: 'Courier New' !important; font-size: 12px !important;">**登录程序，有三次输入账号、密码的机会，错误三次账号锁定**
user = 'hello world' paswd = 123456 username = input("请输入用户名：")
password = input("请输入密码:") for i in range(3): if username == user and int(password) == paswd: #判断用户名和密码是否都匹配 print("欢迎您的到来") break
    elif i < 2:
        username = input("请输入用户名：")
        password = input("请输入密码") elif i == 2: print("账户已锁定") break</pre>

3，购物车程序

<pre style="margin: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-family: 'Courier New' !important; font-size: 12px !important;">**功能：
1，输入余额
2，显示商品列表
3，输入要购买的东西
4，判断是否有能力购买
5，是否继续
6，输出已购买的商品和余额**</pre>

<pre style="margin: 0px; padding: 0px; white-space: pre-wrap; word-wrap: break-word; font-family: 'Courier New' !important; font-size: 12px !important;">shop_car = []#用来存放购买的商品
goods = { 1:['手机',2500], 2:['电脑',3500], 3:['自行车',4500], 4:['宝马',20000]
}#商品列表
while True:
    salary = input("你有多少钱：") # 输入有多少钱
    if salary.isdigit(): # 判断是否为整数
        salary = int(salary) # 将字符串转化为整数
        print("是否要买东西：")
        flag1 = input("Y      N:") if flag1.upper() == 'N': # 将字符串大写
            exit("欢迎下次光临") # 退出程序并输出“欢迎下次光临”
        elif flag1.upper() == 'Y': break                # 终止循环
        elif flag1.upper() == 'Q':
            exit("欢迎下次光临") elif salary.upper() == 'Q':
        exit("欢迎下次光临") while True: print("淘宝".center(30,'-')) # 输出以-----淘宝------
        for i in goods: # 循环输出
            print(i,goods[i]) print("淘宝".center(30, '-'))
        choice_good = input("请输入商品编码：")#接受一个字符串
        if choice_good.isdigit() :
            choice_good = int(choice_good) if choice_good >= 1 and choice_good <= 4: if salary >= goods[choice_good][1]:
                    shop_car.append(goods[choice_good][0]) # 给字典中添加元素
                    salary = salary - goods[choice_good][1] print("您购买的商品为：", goods[choice_good][0]) print("余额为：", salary) print("是否继续：")
                    contin = input("Y    N") if contin.upper() == 'N': break
                    elif contin.upper() == 'Q': break
                else: print('余额不足') print("是否继续：")
                    contin = input("Y    N") if contin.upper() == 'N': break
                    elif contin.upper() == 'Q': break
            else : print("没有这个编号") continue # 暂停本次循环
        elif choice_good.upper() == "Q" : break
        else: print("我看不懂。。。") print("你买了：",end =' ') for i in shop_car: print(i,end=' ') print() print("余额为：",salary) print("欢迎下次光临")</pre>

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