Generating .pyc/.pyo from a make file

**Roland Heiber** · Jul 18 '05, 09:00 PM

Re: Generating .pyc/.pyo from a make file

Tim Daneliuk wrote:[color=blue]
> I use a makefile to create distribution tarballs of freestanding Python
> programs and their documentation. I cannot seem to find the right
> command line option to just generate a pyc/pyo file from the program
> and then exit. If I use 'python -OOOO -c"import myprog"' it creates
> the pyo file, but myprog starts up and keeps running.
>
> IOW, I need a batch method for generating compiled python. I know it
> exists, but I can't find it for some reason ...
>
> TIA,[/color]
Hi,

take a look at http://docs.python.org/lib/module-compileall.html

HtH, Roland

**Tim Daneliuk** · Jul 18 '05, 09:00 PM

Re: Generating .pyc/.pyo from a make file

Roland Heiber wrote:
[color=blue]
> Tim Daneliuk wrote:
>[color=green]
>> I use a makefile to create distribution tarballs of freestanding Python
>> programs and their documentation. I cannot seem to find the right
>> command line option to just generate a pyc/pyo file from the program
>> and then exit. If I use 'python -OOOO -c"import myprog"' it creates
>> the pyo file, but myprog starts up and keeps running.
>>
>> IOW, I need a batch method for generating compiled python. I know it
>> exists, but I can't find it for some reason ...
>>
>> TIA,[/color]
>
> Hi,
>
> take a look at http://docs.python.org/lib/module-compileall.html
>
> HtH, Roland[/color]

It does - thanks. One more question: Are pyc and pyo file portable
across operating systems? I suspect not since I generated a pyo
on a FreeBSD machine that will not run on a Win32 machine. I was
under the impression that "compiled" meant optimized byte code that
was portable across implementations , but it looks to not be the case...

--
----------------------------------------------------------------------------
Tim Daneliuk tundra@tundrawa re.com
PGP Key: http://www.tundraware.com/PGP/

**Roland Heiber** · Jul 18 '05, 09:00 PM

Re: Generating .pyc/.pyo from a make file

Tim Daneliuk wrote:[color=blue]
> It does - thanks. One more question: Are pyc and pyo file portable
> across operating systems? I suspect not since I generated a pyo
> on a FreeBSD machine that will not run on a Win32 machine. I was
> under the impression that "compiled" meant optimized byte code that
> was portable across implementations , but it looks to not be the case...
>[/color]

Hi,

..pyc's should be, cause it's standard python-bytecode, if you use
massive optimizations it depends not on the os but on the underlying
cpu/architecture ...

So long, Roland

**Steve Holden** · Jul 18 '05, 09:00 PM

Re: Generating .pyc/.pyo from a make file

Roland Heiber wrote:
[color=blue]
> Tim Daneliuk wrote:
>[color=green]
>> It does - thanks. One more question: Are pyc and pyo file portable
>> across operating systems? I suspect not since I generated a pyo
>> on a FreeBSD machine that will not run on a Win32 machine. I was
>> under the impression that "compiled" meant optimized byte code that
>> was portable across implementations , but it looks to not be the case...
>>[/color]
>
> Hi,
>
> ..pyc's should be, cause it's standard python-bytecode, if you use
> massive optimizations it depends not on the os but on the underlying
> cpu/architecture ...
>
> So long, Roland[/color]

You probably tried to use a bytecode file from *one* version of Python
with an interpreter of another version. Python actually checks the first
four bytes of the .pyc file for a compatible "magic number" before
accepting the file for execution.

regards
Steve
--
Meet the Python developers and your c.l.py favorites March 23-25
Come to PyCon DC 2005 http://www.python.org/pycon/2005/
Steve Holden http://www.holdenweb.com/

**Tim Daneliuk** · Jul 18 '05, 09:01 PM

Re: Generating .pyc/.pyo from a make file

Steve Holden wrote:
[color=blue]
> Roland Heiber wrote:
>[color=green]
>> Tim Daneliuk wrote:
>>[color=darkred]
>>> It does - thanks. One more question: Are pyc and pyo file portable
>>> across operating systems? I suspect not since I generated a pyo
>>> on a FreeBSD machine that will not run on a Win32 machine. I was
>>> under the impression that "compiled" meant optimized byte code that
>>> was portable across implementations , but it looks to not be the case...
>>>[/color]
>>
>> Hi,
>>
>> ..pyc's should be, cause it's standard python-bytecode, if you use
>> massive optimizations it depends not on the os but on the underlying
>> cpu/architecture ...
>>
>> So long, Roland[/color]
>
>
> You probably tried to use a bytecode file from *one* version of Python
> with an interpreter of another version. Python actually checks the first
> four bytes of the .pyc file for a compatible "magic number" before
> accepting the file for execution.
>
> regards
> Steve[/color]

Aha! Exactly ... and that makes perfect sense too. D'oh! I guess a better
distribution strategy would be to have the installation program generate the pyo
file at installation time...

Thanks -

--
----------------------------------------------------------------------------
Tim Daneliuk tundra@tundrawa re.com
PGP Key: http://www.tundraware.com/PGP/

**Steve Holden** · Jul 18 '05, 09:01 PM

Re: Generating .pyc/.pyo from a make file

Tim Daneliuk wrote:
[color=blue]
> Steve Holden wrote:
>[color=green]
>> Roland Heiber wrote:
>>[color=darkred]
>>> Tim Daneliuk wrote:
>>>
>>>> It does - thanks. One more question: Are pyc and pyo file portable
>>>> across operating systems? I suspect not since I generated a pyo
>>>> on a FreeBSD machine that will not run on a Win32 machine. I was
>>>> under the impression that "compiled" meant optimized byte code that
>>>> was portable across implementations , but it looks to not be the case...
>>>>
>>>
>>> Hi,
>>>
>>> ..pyc's should be, cause it's standard python-bytecode, if you use
>>> massive optimizations it depends not on the os but on the underlying
>>> cpu/architecture ...
>>>
>>> So long, Roland[/color]
>>
>>
>>
>> You probably tried to use a bytecode file from *one* version of Python
>> with an interpreter of another version. Python actually checks the
>> first four bytes of the .pyc file for a compatible "magic number"
>> before accepting the file for execution.
>>
>> regards
>> Steve[/color]
>
>
> Aha! Exactly ... and that makes perfect sense too. D'oh! I guess a
> better
> distribution strategy would be to have the installation program generate
> the pyo
> file at installation time...
>
> Thanks -
>[/color]
That's what most sensible distributions do.

regards
Steve
--
Meet the Python developers and your c.l.py favorites March 23-25
Come to PyCon DC 2005 http://www.pycon.org/
Steve Holden http://www.holdenweb.com/

**vincent wehren** · Jul 18 '05, 09:01 PM

Re: Generating .pyc/.pyo from a make file

Tim Daneliuk wrote:[color=blue]
> Steve Holden wrote:
>[color=green]
>> Roland Heiber wrote:
>>[color=darkred]
>>> Tim Daneliuk wrote:
>>>[/color][/color]
> Aha! Exactly ... and that makes perfect sense too. D'oh! I guess a
> better
> distribution strategy would be to have the installation program generate
> the pyo
> file at installation time...
>
> Thanks -[/color]

Also, the *.py? files contain the full pathname of the *.py they have
been compiled from. Copying them to other path locations will give you
the wrong __file___ information in tracebacks.

--
Vincent Wehren

**Roland Heiber** · Jul 18 '05, 09:01 PM

Re: Generating .pyc/.pyo from a make file

Roland Heiber wrote:[color=blue]
> Tim Daneliuk wrote:[color=green]
>> under the impression that "compiled" meant optimized byte code that[/color][/color]

You where right, i was totally mislead by "optimized" ... ;)

Greetings, Roland

Generating .pyc/.pyo from a make file

Generating .pyc/.pyo from a make file

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