几个python小程序

python小程序

• 1-100求和　

def Sum(x, y):
    return x+y
print reduce(lambda x,y:x+y,range(1,101))

i = 1
j = 0
while  i < 101:
    j = i + j
    i += 1
print j

•  输出1-100之间的奇偶数

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

• 计算1-2+3-4+5-6...99的和

i = 1
j = 0
k = 0
while i < 100:
    if i%2 == 0:
        j = i + j
    if i%2 == 1:
        k = i + k
    i += 1
print k + (-j)


i = 0
j = 1
while j < 100:
    temp = j%2
    if temp == 1:
        i = i + j
    else:
        i = i - j
    j += 1
print i

• 实现用户登录，超过3次自动退出

i = 0
name = "nihao"
psw = "12345"
while True:
    if i == 3:
        print "错误3次退出！"
        break
    else:
        a = raw_input("请输出账号：").strip()
        b = raw_input("请出入密码：").strip()
        if a == name and b == psw:
            print "登录成功！"
            break
        else:
            print "账号或密码错误！\n"
            i += 1