day4(while 、练习题)

一、while ... else 方法

day4(while 、练习题)

while else 的作用就是,确定循环正确执行完毕,else里面可以提示完成的情况。

二、练习题

day4(while 、练习题)

day4(while 、练习题)

1、编译型语言是编译完之后执行,解释性语言是边编译边执行,编译型语言有 java 、c ,解释型语言 有python
2、在解释器里运行代码,用解释器运行python 文件
3、单行注释用'' "" 都可以 多行只能用 """" """
4、True False
5、注意变量名称不能以数字开头,不能有特殊符号,变量名不能词不达意,官方建议变量名称使用下划线 如 your_name = "SmallNine"
6、id函数 具体使用 id()

7、

count = 0
user = "seven"
user_1 = "alex"
password = "
while count < 3:
    user_ipt = input("输入你的账号")
    user_pw = input("输入你的密码")
    if user_ipt == user or user_ipt == user_1 and user_pw == password :
        print(user_ipt,"登录成功")
        break
    elif user_ipt != user or user_ipt != user_1 and user_pw != password :
        print("用户名密码输入错误")
    count += 1

8、

a)

count = 1
num = 0
while count <= 100:
    if count%2 ==0:
        num = num + count
    else:
        num = num - count
    count += 1
print(num)

b)

count = 0
while count <=12 :
    if count == 6:
        pass
    elif count == 10:
        pass
    else:
        print(count)
    count += 1

C)

count = 0
num =100
while count < 102 :
print(num)
if count < 50:
num -= 1
elif count == 50 :
num =0
else:
num +=1
count +=1

D)

count = 0
while count < 100 :
    if count%2 ==1:
        print(count)
    count +=1

E)

count = 0
while count <100 :
    if count % 2 ==0:
        print(count)
    count += 1

9、

n2 指向的是n1的内存地址也就是 123456

(1)、

user = input("姓名: ")
local = input("地点: ")
like = input("爱好: ")
info = """
敬爱的 %s 在 %s  %s
"""%(user,local,like)
print(info)

(2)、

while True:
    user = int(input("输入年份"))
    if user %4 == 0 and user % 100 != 0:
        print(user,"是闰年")
    elif user %400 == 0:
        print(user,"是闰年")
    else:
        print("不是呦")
(3)、
user = 0.0325
mn = 10000
year = 0
num = 0
while num < 20000:
    print(year)
    count = mn * user
    num = count + mn
    print(num)
    mn = num
    year += 1

作业、

user = 'xiaojiu'
passwd = '
count = 0
while count <3 :
    ipt = input("输入用户名:  ")
    pwd = input("输入密码: ")
    if ipt == user and pwd == passwd:
        print("欢迎",ipt)
        break
    else:
        print("错误")
    count += 1
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