python条件语句和while循环的实例

#!/usr/bin/env python
#coding:utf-8
#用户登录
while True:
    username = raw_input('请输入用户名：')
    passwd = raw_input('请输入密码：')
    
    if username == "gaojunsheng" and passwd == "sheng*1994":
        print "登陆成功，欢迎使用"
        break
    else:
        print "密码错误，请重新输入"

 

#!/usr/bin/env python
#coding:utf-8
#输出1234568910

count = 1
while count < 11:
　　if count == 7:
　　　　pass
　　else:
　　　　print count
　　count = count + 1

 

#!/usr/bin/env python
#coding:utf-8
#求1-100所有数的和
count = 1
sum = 0 
while count < 101:
　　sum = count + sum
　　count = count + 1
print sum

 

#!/usr/bin/env python
#coding:utf-8
#求1-100所有偶数

count = 1
while count < 101:
　　result = count % 2
　　if result == 0:
　　　　print count
　　else:
　　　　pass
　　count = count + 1

我自己想的
#!/usr/bin/env python
#coding:utf-8
#求1-2+3-4+5....99的所有数的和

count = 1
sum_ou = 0
sum_ji = 0
while count < 100:
　　result = count % 2
　　if result == 0:
　　　　sum_ou = count + sum_ou
　　else:
　　　　sum_ji = sum_ji + count
　　　count = count + 1
sum = sum_ji-sum_ou
print sum

老师解析的
#!/usr/bin/env python
#coding:utf-8
#求1-2+3-4+5....99的所有数的和
count = 1
sum = 0
while count < 100:
　　temp = count % 2
　　if temp == 0:
　　　　sum = sum - count
　　else:
　　　　sum = sum + count
　　count = count + 1
print sum