python学习练习1

#使用while循环输出1 2 3 4 5 6  8 9 10
count = 1 
while count <= 10:
    if count == 7:
        count += 1
        continue
    print(count)
    count += 1

#求1-100的所有数的和
count = 1
sum = 0
while count <= 100:
    sum += count
    count = count + 1
print (sum)

#求1-100内的所有有奇数    
count = 1 
while count <= 100:
    print(count)
    count = count + 2

#输出1-100内的所有偶数
count = 1
while count <= 100:
    count += 1
    print(count)
    count += 1

#求1-2+3-4+5...99的所有的数的和
count = 1 
sum1 = 1
sum2 = 1
while count < 100:
    count += 1
    sum1 += count
    count += 1
    sum2 += count
print(sum2-sum1)
    

#用户登录（三次机会重试）
n = 1
for count in {1,2,3,4}:
    if n < 4:
        name = input("请输入账号")
        password = input(‘请输入密码:‘)
    else:
        print(‘重试次数超过3次，请稍后再尝试‘)
        continue
    if name == ‘mao‘ and password == ‘chun‘:
        print(‘欢迎进入到新世界‘)
        break
    else:
        print(‘您输错账号密码%s次‘%n)
        print(‘请重新输入账号和密码‘)
    n = n + 1