列表的顺序访问与随机访问，列表顺序访问,class Tobj(o

列表的顺序访问与随机访问，列表顺序访问,class Tobj(o

class Tobj(object):    def __init__(self, serial, val=0):        self.serial = serial        self.val = val    def __repr__(self):        return "%s(%s)" % (            self.__class__.__name__,            ', '.join([                "%r:%r" % (k, v)                for k, v in self.__dict__.items()                ])            )def init(L):    return [        Tobj(i)        for i in range(L)        ]def show():    for obj in objlst:        print objdef serialset(val=1):    for obj in objlst:        obj.val = valdef randomset(val=2):    for i in xrange(len(objlst)):        objlst[i].val = valdef tester():    serialset(1)    show()    randomset(2)    show()if __name__ == "__main__":    objlst = init(1000)    import timeit    t1 = timeit.Timer('serialset()', "from __main__ import serialset")    print t1.timeit()    t2 = timeit.Timer('randomset()', "from __main__ import randomset")    print t2.timeit()