几个python小程序

python小程序

1-100求和

 1 def Sum(x, y):
 2     return x+y
 3 print reduce(lambda x,y:x+y,range(1,101))
 4 
 5 i = 1
 6 j = 0
 7 while  i < 101:
 8     j = i + j
 9     i += 1
10 print j

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输出1-100之间的奇偶数

1 i = 1
2 a = []
3 while i < 100:
4     if i%2 == 0:
5         a.append(i)
6     i += 1
7 print a

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计算1-2+3-4+5-6...99的和

 1 i = 1
 2 j = 0
 3 k = 0
 4 while i < 100:
 5     if i%2 == 0:
 6         j = i + j
 7     if i%2 == 1:
 8         k = i + k
 9     i += 1
10 print k + (-j)
11 
12 
13 i = 0
14 j = 1
15 while j < 100:
16     temp = j%2
17     if temp == 1:
18         i = i + j
19     else:
20         i = i - j
21     j += 1
22 print i

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实现用户登录，超过3次自动退出

 1 i = 0
 2 name = "nihao"
 3 psw = "12345"
 4 while True:
 5     if i == 3:
 6         print "错误3次退出！"
 7         break
 8     else:
 9         a = raw_input("请输出账号：").strip()
10         b = raw_input("请出入密码：").strip()
11         if a == name and b == psw:
12             print "登录成功！"
13             break
14         else:
15             print "账号或密码错误！
"
16             i += 1

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