第二天python小练习题

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

#使用while循环输入 1 2 3 4 5 6 8 9 10
"""
n = 0
while n >=0 and n < 10 :
n += 1
if n == 7 :
continue
print(n)
#求1-100的所有数的和
"""
"""
sum = 0
n = 1
while n > 0 and n < 101 :
sum = sum + n
n += 1
#print(n)
print(sum)
"""
#输出 1-100 内的所有奇数
"""
n = 0
while n >= 0 and n < 101 :
if n % 2 != 0:
print(n)
n += 1
"""

#输出 1-100 内的所有偶数
"""
n = 1
while n > 0 and n < 101 :
if n % 2 == 0 :
print(n)
n += 1
"""

#求1-2+3-4+5 ... 99的所有数的和
"""
n = 0
m = 1
sum = 0
sum_1 = 0
sum_2 = 0
while n >= 0 and n < 101 :
if n % 2 != 0:
sum_1 = sum_1 + n
print(n)
n += 1
while m > 0 and m < 100 :
if m % 2 == 0 :
sum_2 = sum_2 + m
print(m)
m += 1
sum = sum_1 - sum_2
print(sum)
"""

#用户登陆（三次机会重试）
import getpass
n = 1
while n > 0 and n < 4 :
print('仅三次输入机会')
username = input('请输入用户名:')
pwd = getpass.getpass('请输入密码:')
if username != "shilx" and pwd != "1234" :
n +=1
continue
else :
print('登录成功')
break