既然python已经是解释型的语言，为什么还需要一个中间语言呢？不是很理解！
谢谢各位。
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On 2/14/06, zhang hiver <hiversoft at gmail.com> wrote:
> 既然python已经是解释型的语言，为什么还需要一个中间语言呢？不是很理解！
> 谢谢各位。

pyc不是中间语言，它只是中间代码。目的就是为了加快执行速度。就象java一样，不也是如此嘛。特别象解释性语言如何提高性能是很重要的，自动化的编译是对性能的提高。

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编译的速度快一些吧？



On 2/14/06, zhang hiver <hiversoft at gmail.com> wrote:
>
> 既然python已经是解释型的语言，为什么还需要一个中间语言呢？不是很理解！
> 谢谢各位。
>
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源代码人很容易读懂，但计算机解析它需要时间。如果比较大的脚本，解析时间就值得考虑了。
字节码计算机处理起来就容易的多。因为python是跨平台的，又要让计算机容易读懂，又要跨平台，因此就有了 pyc.pyo 呵呵
一次解析，多次运行总比每次运行都解析要省时间

在06-2-14，zhang hiver <hiversoft at gmail.com> 写道：
>
> 既然python已经是解释型的语言，为什么还需要一个中间语言呢？不是很理解！
> 谢谢各位。
>
> _______________________________________________
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> Post: send python-chinese at lists.python.cn
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>


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On 2/14/06, HoLin <holin.he at gmail.com> wrote:
> 编译的速度快一些吧？
>

不准确。pyc就是编译的结果。应该是：执行的速度快一些。

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On 2/14/06, 魏忠 <weizhong2004 at gmail.com> wrote:
> 源代码人很容易读懂，但计算机解析它需要时间。如果比较大的脚本，解析时间就值得考虑了。
> 字节码计算机处理起来就容易的多。因为python是跨平台的，又要让计算机容易读懂，又要跨平台，因此就有了
> pyc.pyo 呵呵
> 一次解析，多次运行总比每次运行都解析要省时间
>

同时python这种中间代码，象java一样，是跨平台的。

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：）我的意思就是说pyc是编译的，执行数度快些。
没讲清楚。


On 2/14/06, limodou <limodou at gmail.com> wrote:
>
> On 2/14/06, HoLin <holin.he at gmail.com> wrote:
> > 编译的速度快一些吧？
> >
>
> 不准确。pyc就是编译的结果。应该是：执行的速度快一些。
>
> --
> I like python!
> My Blog: http://www.donews.net/limodou
> NewEdit Maillist: http://groups.google.com/group/NewEdit
>
> _______________________________________________
> python-chinese
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谢谢各位，那么pyc和pyo又有什么区别呢？


在06-2-14，HoLin <holin.he at gmail.com> 写道：
>
> ：）我的意思就是说pyc是编译的，执行数度快些。
> 没讲清楚。
>
>
>  On 2/14/06, limodou <limodou at gmail.com> wrote:
>
> > On 2/14/06, HoLin <holin.he at gmail.com> wrote:
> > > 编译的速度快一些吧？
> > >
> >
> > 不准确。pyc就是编译的结果。应该是：执行的速度快一些。
> >
> > --
> > I like python!
> > My Blog: http://www.donews.net/limodou
> > NewEdit Maillist: http://groups.google.com/group/NewEdit
> >
> > _______________________________________________
> > 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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On 2/14/06, zhang hiver <hiversoft at gmail.com> wrote:
> 谢谢各位，那么pyc和pyo又有什么区别呢？
>

pyo是优化编译，而pyc是非优化编译。就象C编译器的 -O 选项差不多。

--
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O
I C.


thx.


在06-2-14，limodou <limodou at gmail.com> 写道：
>
> On 2/14/06, zhang hiver <hiversoft at gmail.com> wrote:
> > 谢谢各位，那么pyc和pyo又有什么区别呢？
> >
>
> pyo是优化编译，而pyc是非优化编译。就象C编译器的 -O 选项差不多。
>
> --
> I like python!
> My Blog: http://www.donews.net/limodou
> NewEdit Maillist: http://groups.google.com/group/NewEdit
>
> _______________________________________________
> python-chinese
> Post: send python-chinese at lists.python.cn
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大概可以类比为 java的 class文件

在06-2-14，zhang hiver <hiversoft at gmail.com> 写道：
>
> O
> I C.
>
>
> thx.
>
>
> 在06-2-14，limodou <limodou at gmail.com> 写道：
> >
> > On 2/14/06, zhang hiver <hiversoft at gmail.com> wrote:
> > > 谢谢各位，那么pyc和pyo又有什么区别呢？
> > >
> >
> > pyo是优化编译，而pyc是非优化编译。就象C编译器的 -O 选项差不多。
> >
> > --
> > I like python!
> > My Blog: http://www.donews.net/limodou
> > NewEdit Maillist: http://groups.google.com/group/NewEdit
> >
> > _______________________________________________
> > 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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对于反复执行的代码，不必要反复进行语法检查、语法树构造等过程，这些东西都写成PYC的形式，只要跟源文件做一个版本比对就可以，能够提升不少效率。
另外，对于一个完备的虚拟机，有个面向虚拟机的"汇编"语言，还是很有意义的。

在06-2-14，zhang hiver <hiversoft at gmail.com> 写道：
>
> 既然python已经是解释型的语言，为什么还需要一个中间语言呢？不是很理解！
> 谢谢各位。
>
> _______________________________________________
> python-chinese
> Post: send python-chinese at lists.python.cn
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>


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看python的文档，好像在import时速度快点：

pyc:python byte-compiled code files

A program doesn't run any faster when it is read from a .pyc or .pyo file
than when it is read from a .py file; the only thing that's faster about
.pyc or .pyo files is the speed with which they are loaded.



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