Python语言学习 （三）1.2

装饰器：

def authorize1(funname):
    def wrapper(*args,**kwargs):
        username = raw_input('username:')
        password = raw_input('password:')
        if username == 'tina' and password == '1234':
            funname(*args,**kwargs)
        else:
            print "you are not allowed"
    return wrapper

def search(keyword):
    print 'user search product'

@authorize1
def order(itemid):
    print 'user order',itemid


def pay(orderid):
    print 'user pay'

order(1234)



迭代器：
itertools:
permutations：排列   combinations:组合   product:笛卡尔积  repeat：重复  chain：链接一组迭代器

import itertools

x = [1,2,3,4]

#for i in x:
    #print i

for p in itertools.permutations(x, 2):
    print p

piter = itertools.permutations(x,2)
citer = itertools.combinations(x,2)
pditer = itertools.product(x,y)

for i in itertools.chain(piter,citer,pditer):
    print i