1.使用while循环输入1 2 3 4 5 6  8 9 10

count = 0
while count < 10:
    count = count + 1
    if count == 7:
        print(" ",end = "")
        continue
    else:
        print(count,end = " ")

2.求1 - 100的所有的数的和

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

3.输出1 - 100的所有的奇数

count = 1
row = 0
while count <= 100:
    if count % 2 == 1:
        row = row + 1
        print("%2d"%(count),end = "")
        if row % 10 == 0:
            print()
        else:
            print(" ",end = "")
    count = count + 1

4.输出1 - 100 的所有的偶数

 

count = 1
row = 0
while count <= 100:
    if count % 2 == 0:
        row = row + 1
        print("%2d"%(count),end = "")
        if row % 10 == 0:
            print()
        else:
            print(" ",end = "")
    count = count + 1

 

 

 

5.求1+2+3+4+5...99的所有数的和

 

count = 1
sum = 0
while count <= 99:
    sum += count
    count = count + 1
print(sum)

 

 

 

6.用户登录(三次重试机会)

times = 1
username = input("Please input your username:")
while times <= 3:
    if username == "John":
        print("Welcome Back!",end = "")
        break
    else:
        if times % 3 != 0:
            print("Wrong input!")
        else:
            print("Please check out your username after 5 minutes!",end = "")
            break
    times = times + 1
    username = input("Please input your username:")