Python 习题一

1.使用while循环输入 1 2 3 4 5 6 8 9 10

# Author：Tony.lou
i = 1
while i < 11:
    if i == 7:
        pass
    else:
        print (i)
    i+=1

2.求1-100所有的和

# Author：Tony.lou

i = 0
n = 0
while i <100:
    tmp = i % 2
    if tmp == 0:
        n = n - i
    else:
        n = n + i
    i = i + 1
print(n)

print(sum(i for i in range(1,101)))

3.输出1-100内所有基数

i = 0
while i < 101:
    tmp = i % 2
    if tmp != 0:
        print(i)
    else:
        pass
    i+=1

for i in range(1,100,2):
    print(i)

4.求1-2+3-4+5..99所有数的和

# Author：Tony.lou

i = 0
n = 0
while i <100:
    tmp = i % 2
    if tmp == 0:
        n = n - i
    else:
        n = n + i
    i = i + 1
print(n)

5.用户三次登录

count = 0

while count < 3:
    user = input('user:')
    password = input('password：')
    if user == 'tony' and password =='Omd':
        print('welcome')
        print('........')
        break
    else:
        print('error..try again')
    count += 1