#迭代器
class switch(object):    def __init__(self,value):        self.value=value        self.fall=False
#迭代器方法    def __iter__(self):        yield self.match        raise StopIteration    def match(self,*args):        if self.fall or not args:            return True        elif self.value in args:            self.fall=True            return True        else:            return False

    v=‘ten‘    for case in switch(v):        if case(‘one‘):            print 1            break        if case(‘ten‘):            print 10            break