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标题：[python-chinese] 请问定义了get, set, delete 这些方法,类的实例如何直接调用这些方法呢?

楼主 2007年09月20日星期四 23:41

萧连衣 xiaolianyi在gmail.com
星期四九月 20 23:41:28 HKT 2007

hi,´ó¼ÒºÃ:)

¶¨ÒåÁË__get__, __set__, __delete__ ÕâÐ©·½·¨,ÀàµÄÊµÀýÈçºÎÖ±½Óµ÷ÓÃÕâÐ©·½·¨ÄØ?
¶ø²»ÊÇÊ¹ÓÃÀàÀ´µ÷ÓÃ(±ÈÈç: Person.__get__(....) or Person.__set__(....))
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季鹏

0楼 2007年09月21日星期五 00:40

Samuel Chi princeofdatamining在gmail.com
星期五九月 21 00:40:54 HKT 2007

Ò»Ê±Ïë²»ÆðÀ´__get__ºÍ__set__ÓÃÀ´¸ÉÊ²Ã´ÁË,
Ö»¼ÇµÃ__getitem__/__setitem__ÓÃÓÚË÷Òý,
__getattr__/__setattr__ÓÃÓÚ×Ö¶Î

__del__µÄÓÃ·¨:
del listdemo[index]»òÕßdel dictdemo[key]»òÕßdel instance.fieldname

ÔÚ07-9-20£¬ÏôÁ¬ÒÂ <xiaolianyi在gmail.com> Ð´µÀ£º
>
> hi,´ó¼ÒºÃ:)
>
> ¶¨ÒåÁË__get__, __set__, __delete__ ÕâÐ©·½·¨,ÀàµÄÊµÀýÈçºÎÖ±½Óµ÷ÓÃÕâÐ©·½·¨ÄØ?
> ¶ø²»ÊÇÊ¹ÓÃÀàÀ´µ÷ÓÃ(±ÈÈç: Person.__get__(....) or Person.__set__(....))
>
> _______________________________________________
> python-chinese
> Post: send python-chinese在lists.python.cn
> Subscribe: send subscribe to python-chinese-request在lists.python.cn
> Unsubscribe: send unsubscribe to  python-chinese-request在lists.python.cn
> Detail Info: http://python.cn/mailman/listinfo/python-chinese
>
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徐继哲

0楼 2007年09月21日星期五 13:04

萧连衣 xiaolianyi在gmail.com
星期五九月 21 13:04:04 HKT 2007

Ð»Ð»ÐÖµÜ,²»¹ý__delete__ºÍ__del__ÊÇpython¶¨ÒåµÄ²»Í¬·½·¨.
ÎÒÏëÖªµÀ__get__,__delete__ ËûÃÇµÄÓÃ·¨
*.__delete__µÄÎÄµµ¼û:http://docs.python.org/ref/descriptors.html

ÔÚdjangoµÄcontrib\auth\middleware.pyÓÐ¶¨ÒåÕâ¸ö·½·¨.

class LazyUser(object):
    def __get__(self, request, obj_type=None):
        if not hasattr(request, '_cached_user'):
            from django.contrib.auth import get_user
            request._cached_user = get_user(request)
        return request._cached_user

class AuthenticationMiddleware(object):
    def process_request(self, request):
        assert hasattr(request, 'session'), "The Django authentication
middleware requires session middleware to be installed. Edit your
MIDDLEWARE_CLASSES setting to insert '
django.contrib.sessions.middleware.SessionMiddleware'."
        request.__class__.user = LazyUser()
        return None

request.userÓÐºÜ¶àÓÐÓÃµÄ·½·¨:Èç,request.user.authenticate(), is_authenticated()

LazyUser() LazyUserÊµÀý»¯Ê±ÊÇÔõÃ´µÃµ½Ò»¸öUser,ËûµÄ»º´æÊÇÔõÃ´ÊµÏÖµÄÄØ?

ÔÚ07-9-21£¬Samuel Chi <princeofdatamining在gmail.com> Ð´µÀ£º
>
> Ò»Ê±Ïë²»ÆðÀ´__get__ºÍ__set__ÓÃÀ´¸ÉÊ²Ã´ÁË,
> Ö»¼ÇµÃ__getitem__/__setitem__ÓÃÓÚË÷Òý,
> __getattr__/__setattr__ÓÃÓÚ×Ö¶Î
>
> __del__µÄÓÃ·¨:
> del listdemo[index]»òÕßdel dictdemo[key]»òÕßdel instance.fieldname
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刘培

0楼 2007年09月21日星期五 17:34

leopay leopay在gmail.com
星期五九月 21 17:34:37 HKT 2007

ÔÚÒ»¸öÒ³ÃæÇëÇóÖÐµÚÒ»´Îµ÷ÓÃrequest.userÊÇ»áµ÷ÓÃget_user£¬¶øºóÀ´ÔÙµ÷ÓÃrequest.user¾Í»áÖ±½Ó¸ø³öÕâ¸öuserÁË


ÔÚ07-9-21£¬ÏôÁ¬ÒÂ <xiaolianyi在gmail.com> Ð´µÀ£º
>
> Ð»Ð»ÐÖµÜ,²»¹ý__delete__ºÍ__del__ÊÇpython¶¨ÒåµÄ²»Í¬·½·¨.
> ÎÒÏëÖªµÀ__get__,__delete__ ËûÃÇµÄÓÃ·¨
> *.__delete__µÄÎÄµµ¼û:http://docs.python.org/ref/descriptors.html
>
> ÔÚdjangoµÄcontrib\auth\middleware.pyÓÐ¶¨ÒåÕâ¸ö·½·¨.
>
> class LazyUser(object):
>     def __get__(self, request, obj_type=None):
>         if not hasattr(request, '_cached_user'):
>             from django.contrib.auth import get_user
>             request._cached_user = get_user(request)
>         return request._cached_user
>
> class AuthenticationMiddleware(object):
>     def process_request(self, request):
>         assert hasattr(request, 'session'), "The Django authentication
> middleware requires session middleware to be installed. Edit your
> MIDDLEWARE_CLASSES setting to insert '
> django.contrib.sessions.middleware.SessionMiddleware'."
>         request.__class__.user = LazyUser()
>         return None
>
> request.userÓÐºÜ¶àÓÐÓÃµÄ·½·¨:Èç,request.user.authenticate(), is_authenticated()
>
> LazyUser() LazyUserÊµÀý»¯Ê±ÊÇÔõÃ´µÃµ½Ò»¸öUser,ËûµÄ»º´æÊÇÔõÃ´ÊµÏÖµÄÄØ?
>
> ÔÚ07-9-21£¬Samuel Chi <princeofdatamining在gmail.com > Ð´µÀ£º
> >
> > Ò»Ê±Ïë²»ÆðÀ´__get__ºÍ__set__ÓÃÀ´¸ÉÊ²Ã´ÁË,
> > Ö»¼ÇµÃ__getitem__/__setitem__ÓÃÓÚË÷Òý,
> > __getattr__/__setattr__ÓÃÓÚ×Ö¶Î
> >
> > __del__µÄÓÃ·¨:
> > del listdemo[index]»òÕßdel dictdemo[key]»òÕßdel instance.fieldname
>
>
> _______________________________________________
> python-chinese
> Post: send python-chinese在lists.python.cn
> Subscribe: send subscribe to python-chinese-request在lists.python.cn
> Unsubscribe: send unsubscribe to  python-chinese-request在lists.python.cn
> Detail Info: http://python.cn/mailman/listinfo/python-chinese
>
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徐继哲

0楼 2007年09月24日星期一 20:16

xiao lianyi xiaolianyi在gmail.com
星期一九月 24 20:16:33 HKT 2007

:)
Àí½âÁË,__get__¶¨ÒåÁËÒÔºó,python»áÈ¥×Ô¶¯µ÷ÓÃ,ºÇºÇ,ºÜË¬.

request.__class__.user = LazyUser()
²»¹ý»¹ÓÐÒ»¸ö²»Àí½âµÄµØ·½,django¸ÉÂðÒªÓÃÀàµÄÊôÐÔÀ´±£´æuserÄØ?ÎªÊ²Ã´²»ÓÃÊµÀýÄØ?


ÔÚ07-9-21£¬leopay <leopay在gmail.com> Ð´µÀ£º
>
> ÔÚÒ»¸öÒ³ÃæÇëÇóÖÐµÚÒ»´Îµ÷ÓÃrequest.userÊÇ»áµ÷ÓÃget_user£¬¶øºóÀ´ÔÙµ÷ÓÃrequest.user¾Í»áÖ±½Ó¸ø³öÕâ¸öuserÁË
>
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徐鹏

0楼 2007年09月24日星期一 23:28

beck917 beck917在gmail.com
星期一九月 24 23:28:47 HKT 2007

²¹Ï°ÏÂ³£Ê¶.mark

ÔÚ07-9-24£¬xiao lianyi <xiaolianyi在gmail.com> Ð´µÀ£º
>
> :)
> Àí½âÁË,__get__¶¨ÒåÁËÒÔºó,python»áÈ¥×Ô¶¯µ÷ÓÃ,ºÇºÇ,ºÜË¬.
>
> request.__class__.user = LazyUser()
> ²»¹ý»¹ÓÐÒ»¸ö²»Àí½âµÄµØ·½,django¸ÉÂðÒªÓÃÀàµÄÊôÐÔÀ´±£´æuserÄØ?ÎªÊ²Ã´²»ÓÃÊµÀýÄØ?
>
>
> ÔÚ07-9-21£¬leopay <leopay在gmail.com> Ð´µÀ£º
> >
> > ÔÚÒ»¸öÒ³ÃæÇëÇóÖÐµÚÒ»´Îµ÷ÓÃrequest.userÊÇ»áµ÷ÓÃget_user£¬¶øºóÀ´ÔÙµ÷ÓÃrequest.user¾Í»áÖ±½Ó¸ø³öÕâ¸öuserÁË
> >
>
> _______________________________________________
> python-chinese
> Post: send python-chinese在lists.python.cn
> Subscribe: send subscribe to python-chinese-request在lists.python.cn
> Unsubscribe: send unsubscribe to  python-chinese-request在lists.python.cn
> Detail Info: http://python.cn/mailman/listinfo/python-chinese
>
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标题：[python-chinese] 请问 定义了__get__, __set__, __delete__ 这些方法,类的实例如何直接调用这些方法呢?

标题：[python-chinese] 请问定义了get, set, delete 这些方法,类的实例如何直接调用这些方法呢?