各位大虾，

请问如何理解下面的程序语句，本人刚刚涉猎python，不明白这个语句的意思，可否给出一个逻辑关系的简单解释，非常感谢先

            negative_examples_set = filter ( \lambda datapoint : datapoint
not in Q[largest_usefulness_feature_id], \negative_examples_set )

祝：开心

询楷
-- 
XunKai Wei
IEEE Member
Air Force Engineering University
Xi'an, China
Email:xunkai.wei at gmail.com
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可参照：Dive Into Python，16.3节
内建 filter 函数，它接受两个参数：一个函数和一个列表，返回一个列表

在07-11-1，xunkai wei <xunkai.wei在gmail.com> 写道：
>
> 各位大虾，
>
> 请问如何理解下面的程序语句，本人刚刚涉猎python，不明白这个语句的意思，可否给出一个逻辑关系的简单解释，非常感谢先
>
>             negative_examples_set = filter ( \lambda datapoint : datapoint
> not in Q[largest_usefulness_feature_id], \negative_examples_set )
>
> 祝：开心
>
> 询楷
> --
> XunKai Wei
> IEEE Member
> Air Force Engineering University
> Xi'an, China
> Email:xunkai.wei在gmail.com
> _______________________________________________
> 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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ÁíÍ⻹ÓоÍÊÇlambdaº¯ÊýÁË£¬ÊDz»ÊǺܷ½±ã :)

On 11/1/07, yuan xuan <xuanyuan14.leo在gmail.com> wrote:
>
> ¿É²ÎÕÕ£ºDive Into Python£¬16.3½Ú
> ÄÚ½¨ filter º¯Êý£¬Ëü½ÓÊÜÁ½¸ö²ÎÊý£ºÒ»¸öº¯ÊýºÍÒ»¸öÁÐ±í£¬·µ»ØÒ»¸öÁбí
>
> ÔÚ07-11-1£¬xunkai wei < xunkai.wei在gmail.com> дµÀ£º
> >
> > ¸÷λ´óϺ£¬
> >
> > ÇëÎÊÈçºÎÀí½âÏÂÃæµÄ³ÌÐòÓï¾ä£¬±¾È˸ոÕÉæÁÔpython£¬²»Ã÷°×Õâ¸öÓï¾äµÄÒâ˼£¬¿É·ñ¸ø³öÒ»¸öÂß¼­¹ØϵµÄ¼òµ¥½âÊÍ£¬·Ç³£¸ÐлÏÈ
> >
> >             negative_examples_set = filter ( \lambda datapoint :
> > datapoint not in Q[largest_usefulness_feature_id], \negative_examples_set )
> >
> > ×££º¿ªÐÄ
> >
> > ѯ¿¬
> > --
> > XunKai Wei
> > IEEE Member
> > Air Force Engineering University
> > Xi'an, China
> > Email: xunkai.wei在gmail.com
> > _______________________________________________
> > 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
> >
>
>
> _______________________________________________
> 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
>



-- 
Yours,
  fluke
fluke在sfcube.net
http://blog.ospattern.net
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