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Python 2.7 importing pyc files without py files

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  Python 2.7 importing pyc files without py files Mircescu Andrei <mircescu.andrei@gmail.com> - 2014-02-19 14:03 -0800
    Re: Python 2.7 importing pyc files without py files Emile van Sebille <emile@fenx.com> - 2014-02-19 14:25 -0800
      Re: Python 2.7 importing pyc files without py files Mircescu Andrei <mircescu.andrei@gmail.com> - 2014-02-20 05:36 -0800
    Re: Python 2.7 importing pyc files without py files Terry Reedy <tjreedy@udel.edu> - 2014-02-19 17:26 -0500

#66720 — Python 2.7 importing pyc files without py files

Hi,


I encountered a strange issue. I have an application which uses extensively python 2.7.6 (CPython).


The issue that I see is the following:
If there are only pyc files, the loading time of the application is much more than if I have pyc and py files. It is behind with 2 minutes more than if it had py files

Do you have any idea why this is happening ? Maybe is because, python tries to search the py file in all the paths and this search is exhaustive ? This is the best guess I could figure it out but I'm not sure. 

Also, if this is the scenario, there is a way I can stop this, to not search for the py files ? is there an api ? or a compiling flag I should set ?

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#66722

On 2/19/2014 2:03 PM, Mircescu Andrei wrote:

 > If there are only pyc files, the loading time of the application is
 > much more than if I have pyc and py files. It is behind with 2
 > minutes more than if it had py files

You may get some clues by starting python as

/path/to/python/python2.7 -vv

which will provide the details of attempts to import:

[root@vsds4 log]# python2.7 -vv
# installing zipimport hook
import zipimport # builtin
# installed zipimport hook
# trying /usr/local/lib/python2.7/site.so
# trying /usr/local/lib/python2.7/sitemodule.so
# trying /usr/local/lib/python2.7/site.py
# /usr/local/lib/python2.7/site.pyc matches /usr/local/lib/python2.7/site.py
import site # precompiled from /usr/local/lib/python2.7/site.pyc
# trying /usr/local/lib/python2.7/os.so
# trying /usr/local/lib/python2.7/osmodule.so
# trying /usr/local/lib/python2.7/os.py
# /usr/local/lib/python2.7/os.pyc matches /usr/local/lib/python2.7/os.py
import os # precompiled from /usr/local/lib/python2.7/os.pyc
...



HTH,

Emile

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#66755

joi, 20 februarie 2014, 00:25:41 UTC+2, Emile van Sebille a scris:
> On 2/19/2014 2:03 PM, Mircescu Andrei wrote:
> 
> 
> 
>  > If there are only pyc files, the loading time of the application is
> 
>  > much more than if I have pyc and py files. It is behind with 2
> 
>  > minutes more than if it had py files
> 
> 
> 
> You may get some clues by starting python as
> 
> 
> 
> /path/to/python/python2.7 -vv
> 
> 
> 
> which will provide the details of attempts to import:
> 
> 
> 
> [root@vsds4 log]# python2.7 -vv
> 
> # installing zipimport hook
> 
> import zipimport # builtin
> 
> # installed zipimport hook
> 
> # trying /usr/local/lib/python2.7/site.so
> 
> # trying /usr/local/lib/python2.7/sitemodule.so
> 
> # trying /usr/local/lib/python2.7/site.py
> 
> # /usr/local/lib/python2.7/site.pyc matches /usr/local/lib/python2.7/site.py
> 
> import site # precompiled from /usr/local/lib/python2.7/site.pyc
> 
> # trying /usr/local/lib/python2.7/os.so
> 
> # trying /usr/local/lib/python2.7/osmodule.so
> 
> # trying /usr/local/lib/python2.7/os.py
> 
> # /usr/local/lib/python2.7/os.pyc matches /usr/local/lib/python2.7/os.py
> 
> import os # precompiled from /usr/local/lib/python2.7/os.pyc
> 
> ...
> 
> 
> 
> 
> 
> 
> 
> HTH,
> 
> 
> 
> Emile

I cannot start python since i'm embedding it in .net with pythonnet solution.

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#66723

On 2/19/2014 5:03 PM, Mircescu Andrei wrote:
> Hi,
>
>
> I encountered a strange issue. I have an application which uses
> extensively python 2.7.6 (CPython).
>
>
> The issue that I see is the following: If there are only pyc files,
> the loading time of the application is much more than if I have pyc
> and py files. It is behind with 2 minutes more than if it had py
> files
>
> Do you have any idea why this is happening ? Maybe is because, python
> tries to search the py file in all the paths and this search is
> exhaustive ? This is the best guess I could figure it out but I'm not
> sure.

It seems plausible. Once .py is found, the .pyc is in the same directory.

> Also, if this is the scenario, there is a way I can stop this, to not
> search for the py files ?

Try reducing sys.path to the minimum needed.

-- 
Terry Jan Reedy

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