python day1 基本语法作业

一、过7

 start =1
 while start<=10:
     if start !=7:
         print(start)
     start +=1

二、100以内的和

 sum = 0
 start = 1
 while start<=100:
     sum = sum +start
     print(start,sum)
     start+=1

三、100内奇数偶数差的和

 i = 1
 sum = 0
 while i<=100:
     if i%2 ==1:
         sum1 = sum + i
     if i%2 ==0:
         sum =sum1 -i
     print(sum)
     i+=1

四、登陆3次限制

 time = 0
 while time<3:
     name = input("name:")
     passwd = input("pwd:")
     print(name,passwd)
     time+=1
 print('end')