作业:
1、使用while循环输入 1 2 3 4 5 6 8 9 10(不含数字 7)
#!/usr/bin/env python #coding=utf-8 count = 0 while count < 10: count += 1 if count == 7: continue print(count)
2、求1-100的所有数的和
#!/usr/bin/env python #coding=utf8 i = 1 count = 0 while i <= 100: count += i i += 1 print 'total:', count
3、输出 1-100 内的所有奇数
#!/usr/bin/env python #coding=utf8 for i in range(101): if (i % 2) != 0: print i
4、输出 1-100 内的所有偶数
#!/usr/bin/env python #coding=utf8 for i in range(101): if (i % 2) == 0: print i
5、求1-2+3-4+5 ... 99的所有数的和
分析:即(1+3+5+...+99)-(2+4+6+...+98)= 50
#!/usr/bin/env python #coding=utf8 odd = 0 # 统计奇数总和 even = 0 # 统计偶数总和 for i in range(1,100): if (i % 2) != 0: odd += i if (i % 2) == 0: even += i result = odd - even print result
6、用户登陆(三次机会重试)
#!/usr/bin/env python #coding=utf8 import getpass count = 0 total = 3 while 1: name = raw_input('请输入用户名:') pwd = getpass.getpass('请输入密码:') count += 1 if name == "root" and pwd == "123456": print "欢迎,root!" break else: #print "用户名和密码错误,还有",total - count,"次机会" if count == 3: print "用户名和密码错误达3次,退出登录" break print "用户名和密码错误,还有",total - count,"次机会"