Reg Python Byte code

[Steve Holden]

praba kar wrote:
> Dear All,
> 
>       Python 2.3 creates byte code with *.pyc
> extention.  But Python 2.4 creates bytes code with
> *.pyo.  Is there any difference between *.pyc
> and *.pyo?.
> 
Yes. The .pyo files are optimized by removing certain features that 
aren't essential to execution (things like doc strings).

>      Actually After python compiled a program
> then that program will run from the *.pyc byte
> code.  If I delete that byte code what will be
> happen.? 
> 
The next time you import the module concerned the interpreter will 
recreate the .pyc file.

>      If I delete *.pyc byte code in the python
> 2.3 then It will create  again *.pyc byte code.
> But If I delete *.pyo byte code in the python
> 2.4 then It will not create again *.pyo. Why
> this difference.
> 
There is no difference between 2.3 and 2.4 in their treatment of .pyc 
and .pyo files. The .pyo files are used when you give the interpreter 
the -O option to indicate you want optimized performance. Most people 
happily live without ever using this option, but in certain cases it can 
save some run time.

>      If I delete byte code of the python.
> I want to know Whether it will affect the
> performance of the programme or not.
> 
The interpreter will have to take the time to re-create the .pyc on 
imported modules. If the files can't be created (due to permission 
problems or whatever) the module has t be recompiled each execution.

>      Kindly clear me all the doubts regarding
> byte code of python.
> 
> with regards
> Prabahar 
> 
>       
Hope this helps.

regards
  Steve
-- 
Steve Holden       +44 150 684 7255  +1 800 494 3119
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