python 3.5开发之旅 day1

#! /usr/bin/env python
# -*- coding UTF-8 -*-
import getpass
a1 = input("inputusername:")
a2 = getpass.getpass("inputpassword:")
print(a1)
print(a2)

#! /usr/bin/env python
# -*- coding:utf-8 -*-

#输出1-100内的所有奇数


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

       

#! /usr/bin/env python
# -*- coding:utf-8 -*-
#输出1-100内的所有偶数
a = 1 
while a <= 100:
    if a%2 == 0:
        print(a)
    a += 1 

#! /usr/bin/env python
# -*- coding:utf-8 -*-
#求 1-2+3-4...99所有数的和
a = 1
sum = 0 
while a <= 99:
  if a%2 == 1:
      sum = sum + a 
      a += 1 
  else:
      sum = sum -a
      a += 1 
print(sum)

#! /usr/bin/env python
# -*- conding:utf-8 -*-
import time
t1 = 1
while t1 < 4:
    username = input(‘please input your username:‘)
    password = input(‘password:‘)
    if username == ‘zhangsan‘ and password == ‘yes‘:
        print(‘congratulations‘)
        break 
    elif t1 <= 2:
        print(‘error‘)
        t1 += 1
        continue
    else:
        print(‘forbbiden‘)
        time.sleep(10)
        continue