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标题：[python-chinese] 第一帖.请教怎么实现像C语言里的结构？

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楼主 2007年06月19日星期二 20:25

橙子 eyeonme在gmail.com
星期二六月 19 20:25:02 HKT 2007

CÊÇÕâÑùµÄ.

struct  name_info
{
     char  _name[64];
     int    _idx;
}

//´ò¿ªÒ»¸öÎÄ¼þ  _file;
struct  name_info  _name;
for(char i='a'; i<'z'; i++)
{
    _name._name[0] = i;
    _name._idx = 0;

    fwrite(_file, (char*)&_name, sizeof(struct  name_info));
}
//¹Ø±ÕÎÄ¼þ  _file;

³õÑ§Python, Õæ²»ÖªµÀÕâ¶Î´úÂëÓÃ pythonÔõÃ´Ð´£¬Çë´Í½Ì.
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0楼 2007年06月19日星期二 20:32

Ranger.Lee uraka.lee在gmail.com
星期二六月 19 20:32:29 HKT 2007

CÖÐµÄ½á¹¹ÔÚC++ÖÐ¿ÉÒÔÓÃÀàÀ´ÃèÊö£¬PythonÖÐ×ÔÈ»Ò²¿ÉÒÔ¡£

On 6/19/07, ³È×Ó <eyeonme在gmail.com> wrote:
>
> CÊÇÕâÑùµÄ.
>
> struct  name_info
> {
>      char  _name[64];
>      int    _idx;
> }
>
> //´ò¿ªÒ»¸öÎÄ¼þ  _file;
> struct  name_info  _name;
> for(char i='a'; i<'z'; i++)
> {
>     _name._name[0] = i;
>     _name._idx = 0;
>
>     fwrite(_file, (char*)&_name, sizeof(struct  name_info));
> }
> //¹Ø±ÕÎÄ¼þ  _file;
>
> ³õÑ§Python, Õæ²»ÖªµÀÕâ¶Î´úÂëÓÃ pythonÔõÃ´Ð´£¬Çë´Í½Ì.
>
>
>
> _______________________________________________
> 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
>



-- 
Uraka.Lee @ School of Software and Micro-electronic, Peking University,
China
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0楼 2007年06月19日星期二 21:09

huanghao.c huanghao.c在gmail.com
星期二六月 19 21:09:11 HKT 2007

你的 fwrite() 错了吧

size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE
*stream);

python 的话, 你可以试试 file object, 但我不确定它是否能用于 r/w binary file.


橙子 写道:
> C是这样的.
>
> struct name_info
> {
> char _name[64];
> int _idx;
> }
>
> //打开一个文件 _file;
> struct name_info _name;
> for(char i='a'; i<'z'; i++)
> {
> _name._name[0] = i;
> _name._idx = 0;
>
> fwrite(_file, (char*)&_name, sizeof(struct name_info));
> }
> //关闭文件 _file;
>
> 初学Python, 真不知道这段代码用 python怎么写，请赐教.
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> python-chinese
> Post: send python-chinese at lists.python.cn
> Subscribe: send subscribe to python-chinese-request at lists.python.cn
> Unsubscribe: send unsubscribe to  python-chinese-request at lists.python.cn
> Detail Info: http://python.cn/mailman/listinfo/python-chinese

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0楼 2007年06月19日星期二 21:13

大郎 iexper在gmail.com
星期二六月 19 21:13:04 HKT 2007

file("...", "rw")
it is ok


On 6/19/07, huanghao.c <huanghao.c在gmail.com> wrote:
>
> ÄãµÄ fwrite() ´íÁË°É
>
> size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE
> *stream);
>
> python µÄ»°, Äã¿ÉÒÔÊÔÊÔ file object, µ«ÎÒ²»È·¶¨ËüÊÇ·ñÄÜÓÃÓÚ r/w binary file.
>
>
> ³È×Ó Ð´µÀ:
> > CÊÇÕâÑùµÄ.
> >
> > struct name_info
> > {
> > char _name[64];
> > int _idx;
> > }
> >
> > //´ò¿ªÒ»¸öÎÄ¼þ _file;
> > struct name_info _name;
> > for(char i='a'; i<'z'; i++)
> > {
> > _name._name[0] = i;
> > _name._idx = 0;
> >
> > fwrite(_file, (char*)&_name, sizeof(struct name_info));
> > }
> > //¹Ø±ÕÎÄ¼þ _file;
> >
> > ³õÑ§Python, Õæ²»ÖªµÀÕâ¶Î´úÂëÓÃ pythonÔõÃ´Ð´£¬Çë´Í½Ì.
> >
> >
> > ------------------------------------------------------------------------
> >
> > _______________________________________________
> > 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




-- 
ÎÒ×ßµ½Ò»¸öÄ°ÉúµÄµØ·½, ¸æËß±ðÈË ÎÒÒªÈ¥Á÷ÀË
Å¶£¬ÎÒÒªÈ¥ÁÆÉË¡¡

Gtalk: iexper(at)gmail.com
ÓòÃû¹ýÆÚÁË
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0楼 2007年06月19日星期二 21:57

橙子 eyeonme在gmail.com
星期二六月 19 21:57:12 HKT 2007

Î±´úÂë

ÔÚ07-6-19£¬´óÀÉ <iexper在gmail.com> Ð´µÀ£º
>
> file("...", "rw")
> it is ok
>
>
> On 6/19/07, huanghao.c <huanghao.c在gmail.com> wrote:
> >
> > ÄãµÄ fwrite() ´íÁË°É
> >
> > size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE
> > *stream);
> >
> > python µÄ»°, Äã¿ÉÒÔÊÔÊÔ file object, µ«ÎÒ²»È·¶¨ËüÊÇ·ñÄÜÓÃÓÚ r/w binary file.
> >
> >
> > ³È×Ó Ð´µÀ:
> > > CÊÇÕâÑùµÄ.
> > >
> > > struct name_info
> > > {
> > > char _name[64];
> > > int _idx;
> > > }
> > >
> > > //´ò¿ªÒ»¸öÎÄ¼þ _file;
> > > struct name_info _name;
> > > for(char i='a'; i<'z'; i++)
> > > {
> > > _name._name[0] = i;
> > > _name._idx = 0;
> > >
> > > fwrite(_file, (char*)&_name, sizeof(struct name_info));
> > > }
> > > //¹Ø±ÕÎÄ¼þ _file;
> > >
> > > ³õÑ§Python, Õæ²»ÖªµÀÕâ¶Î´úÂëÓÃ pythonÔõÃ´Ð´£¬Çë´Í½Ì.
> > >
> > >
> > >
> > ------------------------------------------------------------------------
> > >
> > > _______________________________________________
> > > 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
>
>
>
>
> --
> ÎÒ×ßµ½Ò»¸öÄ°ÉúµÄµØ·½, ¸æËß±ðÈË ÎÒÒªÈ¥Á÷ÀË
> Å¶£¬ÎÒÒªÈ¥ÁÆÉË¡¡
>
> Gtalk: iexper(at)gmail.com
> ÓòÃû¹ýÆÚÁË
> _______________________________________________
> 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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洪蜀宁

0楼 2007年06月24日星期日 21:12

Shuning Hong hongshuning在gmail.com
星期日六月 24 21:12:19 HKT 2007

Try this:

class name_info:
  pass

f=open(FILENAME,'wb')
f._name = 'a'
f._idx=0
f.write(name_info)
f.close()


On 6/19/07, 橙子 <eyeonme at gmail.com> wrote:
> C是这样的.
>
> struct  name_info
> {
>      char  _name[64];
>      int    _idx;
> }
>
> //打开一个文件  _file;
> struct  name_info  _name;
> for(char i='a'; i<'z'; i++)
> {
>     _name._name[0] = i;
>     _name._idx = 0;
>
>     fwrite(_file, (char*)&_name, sizeof(struct  name_info));
> }
> //关闭文件  _file;
>
> 初学Python, 真不知道这段代码用 python怎么写，请赐教.
>
>
>
> _______________________________________________
> python-chinese
> Post: send python-chinese at lists.python.cn
> Subscribe: send subscribe to
> python-chinese-request at lists.python.cn
> Unsubscribe: send unsubscribe to
> python-chinese-request at lists.python.cn
> Detail Info:
> http://python.cn/mailman/listinfo/python-chinese
>

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0楼 2007年06月26日星期二 09:27

橙子 eyeonme在gmail.com
星期二六月 26 09:27:43 HKT 2007

лл Shuning Hong .

»¹ÊÇ¸Ð¾õpythonµÄÎÄ¼þ²Ù×÷²»ÊÇºÜ·½±ã.

Èç¹û class name_info ÊÇÒ»Ìõ¼ÇÂ¼,ÎÒÔÚÎÄ¼þÀïÃæÒÑ¾Ð´ÁË 10Ìõ¼ÇÂ¼ÁË. ÏÖÔÚÒª¸ÄÐ´µÚÎåÌõµÄ¼ÇÂ¼,ÈçºÎ²Ù×÷?



2007/6/24, Shuning Hong <hongshuning在gmail.com>:
>
> Try this:
>
> class name_info:
> pass
>
> f=open(FILENAME,'wb')
> f._name = 'a'
> f._idx=0
> f.write(name_info)
> f.close()
>
>
> On 6/19/07, ³È×Ó <eyeonme在gmail.com> wrote:
> > CÊÇÕâÑùµÄ.
> >
> > struct  name_info
> > {
> >      char  _name[64];
> >      int    _idx;
> > }
> >
> > //´ò¿ªÒ»¸öÎÄ¼þ  _file;
> > struct  name_info  _name;
> > for(char i='a'; i<'z'; i++)
> > {
> >     _name._name[0] = i;
> >     _name._idx = 0;
> >
> >     fwrite(_file, (char*)&_name, sizeof(struct  name_info));
> > }
> > //¹Ø±ÕÎÄ¼þ  _file;
> >
> > ³õÑ§Python, Õæ²»ÖªµÀÕâ¶Î´úÂëÓÃ pythonÔõÃ´Ð´£¬Çë´Í½Ì.
> >
> >
> >
> > _______________________________________________
> > 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
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李迎辉

0楼 2007年06月26日星期二 09:33

limodou limodou在gmail.com
星期二六月 26 09:33:28 HKT 2007

On 6/26/07, 橙子 <eyeonme在gmail.com> wrote:
> 谢谢 Shuning Hong .
>
> 还是感觉python的文件操作不是很方便.
>
> 如果 class name_info 是一条记录,我在文件里面已经写了 10条记录了. 现在要改写第五条的记录,如何操作?
>
python的写文件是随机存取的，而你要求的是按记录来处理的，这样一般要求每次记录是定长的，然后可以移动文件指针到指定的记录开始的位置，然后写入整条记录。

python的文件处理与C/C++是相同的。

-- 
I like python!
UliPad <>: http://wiki.woodpecker.org.cn/moin/UliPad
My Blog: http://www.donews.net/limodou

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0楼 2007年06月26日星期二 09:52

橙子 eyeonme在gmail.com
星期二六月 26 09:52:46 HKT 2007

ºÇºÇ. ÊÇÎÒ¸ã´íÁË.

¸Õ²Å×ÐÏ¸¿´ÁËÒ»ÏÂ open.__doc__  .
ÔÀ´ÒªÒÔ   ("r+")  µÄ·½Ê½´ò¿ªÎÄ¼þ.   "w" »áÇå¿ÕÎÄ¼þ.  "a"  Ö»»áÌí¼ÓÊý¾Ýµ½Î²²¿. ÔÚ"a"Ä£Ê½ÏÂ, seek. ºÃÏñÃ»ÓÃ.

·Ç³£¸ÐÐ»´ó¼ÒµÄ»Ø¸´. Ð»Ð»!


ÔÚ07-6-26£¬limodou <limodou在gmail.com> Ð´µÀ£º
>
> On 6/26/07, ³È×Ó <eyeonme在gmail.com> wrote:
> > лл Shuning Hong .
> >
> > »¹ÊÇ¸Ð¾õpythonµÄÎÄ¼þ²Ù×÷²»ÊÇºÜ·½±ã.
> >
> > Èç¹û class name_info ÊÇÒ»Ìõ¼ÇÂ¼,ÎÒÔÚÎÄ¼þÀïÃæÒÑ¾Ð´ÁË 10Ìõ¼ÇÂ¼ÁË. ÏÖÔÚÒª¸ÄÐ´µÚÎåÌõµÄ¼ÇÂ¼,ÈçºÎ²Ù×÷?
> >
>
> pythonµÄÐ´ÎÄ¼þÊÇËæ»ú´æÈ¡µÄ£¬¶øÄãÒªÇóµÄÊÇ°´¼ÇÂ¼À´´¦ÀíµÄ£¬ÕâÑùÒ»°ãÒªÇóÃ¿´Î¼ÇÂ¼ÊÇ¶¨³¤µÄ£¬È»ºó¿ÉÒÔÒÆ¶¯ÎÄ¼þÖ¸Õëµ½Ö¸¶¨µÄ¼ÇÂ¼¿ªÊ¼µÄÎ»ÖÃ£¬È»ºóÐ´ÈëÕûÌõ¼ÇÂ¼¡£
>
> pythonµÄÎÄ¼þ´¦ÀíÓëC/C++ÊÇÏàÍ¬µÄ¡£
>
> --
> I like python!
> UliPad <>: http://wiki.woodpecker.org.cn/moin/UliPad
> My Blog: http://www.donews.net/limodou
> _______________________________________________
> 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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