#test_stdout.py
sys.__stdout__=open(r'c:\log.txt','a')
print 'this is a book'
print 'that is a pen'
sys.__stdout__.close()

输出的内容还是放到了屏幕上

--

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On 2/11/06, 魏忠 <weizhong2004 at gmail.com> wrote:
> #test_stdout.py
> sys.__stdout__=open(r'c:\log.txt','a')
> print 'this is a book'
> print 'that is a pen'
> sys.__stdout__.close()
>
> 输出的内容还是放到了屏幕上
不如明显一些？
f = open( r'c:\log.txt', "a+")
print >> f,"this is a book"
print >> f,"that is a pen"
>
> --
>
> 开飞机的舒克
>  http://www.lvye.org/shuke
> msn:weizhong at netease.com
> _______________________________________________
> 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
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>
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--
"""Time is unimportant, only life important!
blogging  :  http://blog.zoomquiet.org/pyblosxom/
wiki enter:   http://wiki.woodpecker.org.cn/moin/ZoomQuiet
in douban:  http://www.douban.com/people/zoomq/
"""

象zoom兄那样做是可以的。
《Python In a Nutshell》(2003)
10.7.1 标准输出及标准错误
sys 模块有 stdout 和 stderr 属性, 这是用于输出的两个文件对象。 除非你使用**某种 shell
重定向**，输出内容将总是发送到执行脚本的终端上。当然现在几乎没有什么真正的终端了:这个所谓的终端通常是一个支持文本输入输出的窗口(比方windows下的一个
控制台 或unix下 一个 xterm 窗口).

我作了一个测试。发现

sys.stdout=...
sys.__stdout__=...
类似的赋值语句虽然执行无误，却并未真正改变 stdout 的值。或许与解释器的设置有关？




--

开飞机的舒克
http://www.lvye.org/shuke
msn:weizhong at netease.com
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import sys
sys.stdout=open(r'c:\log.txt','a')
print 'this is a book'
print 'that is a pen'
sys.stdout.close()

On 2/11/06, Zoom Quiet <zoom.quiet at gmail.com> wrote:
>
> On 2/11/06, 魏忠 <weizhong2004 at gmail.com> wrote:
> > #test_stdout.py
> > sys.__stdout__=open(r'c:\log.txt','a')
> > print 'this is a book'
> > print 'that is a pen'
> > sys.__stdout__.close()
> >
> > 输出的内容还是放到了屏幕上
> 不如明显一些？
> f = open( r'c:\log.txt', "a+")
> print >> f,"this is a book"
> print >> f,"that is a pen"
> >
> > --
> >
> > 开飞机的舒克
> >  http://www.lvye.org/shuke
> > msn:weizhong at netease.com
> > _______________________________________________
> > 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
> >
> >
>
>
> --
> """Time is unimportant, only life important!
> blogging  :  http://blog.zoomquiet.org/pyblosxom/
> wiki enter:   http://wiki.woodpecker.org.cn/moin/ZoomQuiet
> in douban:  http://www.douban.com/people/zoomq/
> """
>
> _______________________________________________
> 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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楼上老兄测试了么？
这个代码据俺测试也是不行的

开飞机的舒克
http://www.lvye.org/shuke
msn:weizhong at netease.com
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根据我的测试
open 改成file就可以了
原因不明


在06-2-11，魏忠 <weizhong2004 at gmail.com> 写道：
>
> 楼上老兄测试了么？
> 这个代码据俺测试也是不行的
>
> 开飞机的舒克
> http://www.lvye.org/shuke
> msn:weizhong at netease.com
>
> _______________________________________________
> 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
>
>


--
Andelf
BLOG:http://blog.sohu.com/members/andelf/
BLOG:http://spaces.msn.com/members/andelf
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呃,再测试
似乎都可以
魏大叔,你用的什么平台?


在06-2-11，Andelf <andelf at gmail.com> 写道：
>
> 根据我的测试
> open 改成file就可以了
> 原因不明
>
>
> 在06-2-11，魏忠 <weizhong2004 at gmail.com> 写道：
> >
> > 楼上老兄测试了么？
> > 这个代码据俺测试也是不行的
> >
> > 开飞机的舒克
> > http://www.lvye.org/shuke
> > msn:weizhong at netease.com
> >
> > _______________________________________________
> > 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
> >
> >
>
>
> --
> Andelf
> BLOG:http://blog.sohu.com/members/andelf/
> BLOG: http://spaces.msn.com/members/andelf




--
Andelf
BLOG:http://blog.sohu.com/members/andelf/
BLOG:http://spaces.msn.com/members/andelf
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嗯，我的是file，不知道为啥copy出来成open了...

On 2/11/06, 魏忠 <weizhong2004 at gmail.com> wrote:
>
> 楼上老兄测试了么？
> 这个代码据俺测试也是不行的
>
> 开飞机的舒克
> http://www.lvye.org/shuke
> msn:weizhong at netease.com
>
> _______________________________________________
> 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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那file和open有什么区别啊?



在06-2-11，sunqiang <sunqiang at gmail.com> 写道：
>
> 嗯，我的是file，不知道为啥copy出来成open了...
>
>


--
Andelf
BLOG:http://blog.sohu.com/members/andelf/
BLOG:http://spaces.msn.com/members/andelf
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hoho,开了两个窗口，所以copy错了，不过好像open也可以的。

On 2/11/06, Andelf <andelf at gmail.com> wrote:
>
> 呃,再测试
> 似乎都可以
> 魏大叔,你用的什么平台?
>
>
> 在06-2-11，Andelf <andelf at gmail.com> 写道：
> >
> > 根据我的测试
> > open 改成file就可以了
> > 原因不明
> >
> >
> > 在06-2-11，魏忠 <weizhong2004 at gmail.com> 写道：
> > >
> > > 楼上老兄测试了么？
> > > 这个代码据俺测试也是不行的
> > >
> > > 开飞机的舒克
> > > http://www.lvye.org/shuke
> > > msn:weizhong at netease.com
> > >
> > > _______________________________________________
> > > 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
> > >
> > >
> >
> >
> > --
> > Andelf
> > BLOG:http://blog.sohu.com/members/andelf/
> > BLOG: http://spaces.msn.com/members/andelf
>
>
>
>
> --
> Andelf
> BLOG:http://blog.sohu.com/members/andelf/
> BLOG: http://spaces.msn.com/members/andelf
>
> _______________________________________________
> 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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先有open，然后有file，好像现在是推荐大家用file...

On 2/11/06, Andelf <andelf at gmail.com> wrote:
>
> 那file和open有什么区别啊?
>
>
>
> 在06-2-11，sunqiang <sunqiang at gmail.com> 写道：
> >
> > 嗯，我的是file，不知道为啥copy出来成open了...
> >
> >
>
>
> --
> Andelf
> BLOG: http://blog.sohu.com/members/andelf/
> BLOG:http://spaces.msn.com/members/andelf
>
> _______________________________________________
> 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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问题解决，是俺自己没看清楚，嘿嘿
当解释器刚刚启动时，使用 sys.__stdout__，当解释器启动完成后，使用 sys.stdout
刚才换用 sys.stdout 之后其实已经生效了，俺粗心未去检查 log.txt 的内容。
file与open是别名的关系，可以用下面的方式验证：
>>> file

>>> open

>>> file==open
True
>>> file is open
True
>>>

C:\>edit test.py

C:\>type test.py
import sys
sys.stdout=open('log.txt','a')
print sys.stdout
print 'this is a book'
print 'that is a pen'
sys.__stdout__.close()

C:\>python test.py

C:\>type log.txt

this is a book
that is a pen

this is a book
that is a pen
--

开飞机的舒克
http://www.lvye.org/shuke
msn:weizhong at netease.com
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