python基础循环

1、使用while循环输入1234568910

 n = 1
 while n < 11:
     if n == 7:
         pass
     else:
         print(n)
     n = n + 1

2、求1 - 100的所有数的和

n = 1
s = 0
while n < 101:
    s = s + n
    n = n + 1

print(s)

3、输出1 - 100内的所有奇数

n = 1
while n < 101:
    temp = n % 2
    if temp == 0:
        pass
    else:
        print(n)
    n = n + 1

print('----end----')

4、输出1 - 100内的所有偶数

n = 1
while n < 101:
    temp = n % 2
    if temp == 0:
        print(n)
    else:
        pass
    n = n + 1

print('----end----')

5、求1 - 2 + 3 - 4 + 5...99的所有数的和

n = 1
s = 0  # s是之前所有数的总和
while n < 100:
    temp = n % 2
    if temp == 0:
        s = s - n
    else:
        s = s + n
    n = n + 1

print(s)

6、设计登录小程序，有三次机会

import datetime
username = "keys"
password = ""
no = 2
while no >= 0:
    input_name = input("请输入你的账号：")
    input_pswd = input("请输入你的密码：")
    if username == input_name and password == input_pswd:
        print("恭喜您"+username+"登录成功,今天是{}".format(datetime.datetime.today()))
        break
    elif input_name == "" or input_pswd == "":
        print("用户名或密码不能为空，请重新输入")
        print("您还有"+str(no)+"次机会！！！")
    else:
        if username != input_pswd or password != input_pswd:
            print("\n账号或密码错误,请重新输入")
            print("温馨提示，您还有"+str(no)+"次机会")
        else:
            print("您的次数已用完。")
    no = no -1