Python簡單基礎小程序

1 九九乘法表

for i in range(9):#從0循環到8
    i += 1#等價於 i = i+1
    for j in range(i):#從0循環到i
        j += 1
        print(j,'*',i,'=',i*j,end = ' ',sep='')
        # end默認在結尾輸出換行，將它改成空格 sep 默認 j,'*',i,'=',i*j 各元素輸出中間會有空格
    print()#這里作用是輸出換行符

i = 1
while i <= 9:
    j = 1
    while j <= i:
        print("%d*%d=%d" % (j,i,i*j),end=' ') # 格式化輸出
        j += 1
    i += 1
    print()

2 登錄程序

登錄程序，有三次輸入賬號、密碼的機會，錯誤三次賬號鎖定
user = 'hello world'
paswd = 123456
username = input("請輸入用戶名：")
password = input("請輸入密碼:")
for i in range(3):
    if username == user and int(password) == paswd: #判斷用戶名和密碼是否都匹配
        print("歡迎您的到來")
        break
    elif i < 2:
        username = input("請輸入用戶名：")
        password = input("請輸入密碼")
    elif i == 2:
        print("賬戶已鎖定")
        break

3，購物車程序

功能： 1，輸入余額 2，顯示商品列表 3，輸入要購買的東西 4，判斷是否有能力購買 5，是否繼續 6，輸出已購買的商品和余額

shop_car = []#用來存放購買的商品
goods = {
    1:['手機',2500],
    2:['電腦',3500],
    3:['自行車',4500],
    4:['寶馬',20000]
}#商品列表
while True:
    salary = input("你有多少錢：") # 輸入有多少錢
    if salary.isdigit(): # 判斷是否為整數
        salary = int(salary) # 將字符串轉化為整數
        print("是否要買東西：")
        flag1 = input("Y      N:")
        if flag1.upper() == 'N': # 將字符串大寫
            exit("歡迎下次光臨") # 退出程序並輸出“歡迎下次光臨”
        elif flag1.upper() == 'Y':
            break                # 終止循環
        elif flag1.upper() == 'Q':
            exit("歡迎下次光臨")
    elif salary.upper() == 'Q':
        exit("歡迎下次光臨")
while True:
        print("淘寶".center(30,'-')) # 輸出以-----淘寶------
        for i in goods: # 循環輸出
            print(i,goods[i])
        print("淘寶".center(30, '-'))
        choice_good = input("請輸入商品編碼：")#接受一個字符串
        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]) # 給字典中添加元素
                    salary = salary - goods[choice_good][1]
                    print("您購買的商品為：", goods[choice_good][0])
                    print("余額為：", salary)
                    print("是否繼續：")
                    contin = input("Y    N")
                    if contin.upper() == 'N':
                        break
                    elif contin.upper() == 'Q':
                        break
                else:
                    print('余額不足')
                    print("是否繼續：")
                    contin = input("Y    N")
                    if contin.upper() == 'N':
                        break
                    elif contin.upper() == 'Q':
                        break
            else :
                print("沒有這個編號")
                continue # 暫停本次循環
        elif choice_good.upper() == "Q" :
            break
        else:
            print("我看不懂。。。")
print("你買了：",end =' ')
for i in shop_car:
    print(i,end=' ')
print()
print("余額為：",salary)
print("歡迎下次光臨")