RE: Automatic import of submodules

2011-11-27 Thread Shambhu Rajak 

-Original Message-
From: Massi [mailto:massi_...@msn.com] 
Sent: 25/11/2011 6:30 PM
To: python-list@python.org
Subject: Automatic import of submodules

Hi everyone,

in my project I have the following directory structure:

plugins
|
-- wav_plug
  |
  -- __init__.py
  -- WavPlug.py
-- mp3_plug
  |
  -- __init__.py
  -- Mp3Plug.py
...
-- etc_plug
  |
  -- __init__.py
  -- EtcPlug.py

Every .py file contain a class definition whose name is identical to
to the file name, so in my main script I have to import each submodule
like that:

from plugins.wav_plug.WavPlug import WavPlug
from plugins.wav_plug.Mp3Plug import Mp3Plug

and so on. This is uncomfortable, since when a new plugin is added I
have to import it too. So my question is, is it possible to iterate
through the 'plugins' directory tree in order to automatically import
the submodules contained in each subdirectory?
I googled and found that the pkgutil could help, but it is not clear
how. Any hints?
Thanks in advance.


=
What you could do is : 

Instead of importing method wise , import the module.

from plugins.wav_plug import WavPlug  

you can then use like this then
WavPlug.WavPlug

This will avoid the-every time importing of each method

Regards,
Shambhu


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Automatic import of submodules

2011-11-25 Thread Massi 
Hi everyone,

in my project I have the following directory structure:

plugins
|
-- wav_plug
  |
  -- __init__.py
  -- WavPlug.py
-- mp3_plug
  |
  -- __init__.py
  -- Mp3Plug.py
...
-- etc_plug
  |
  -- __init__.py
  -- EtcPlug.py

Every .py file contain a class definition whose name is identical to
to the file name, so in my main script I have to import each submodule
like that:

from plugins.wav_plug.WavPlug import WavPlug
from plugins.wav_plug.Mp3Plug import Mp3Plug

and so on. This is uncomfortable, since when a new plugin is added I
have to import it too. So my question is, is it possible to iterate
through the 'plugins' directory tree in order to automatically import
the submodules contained in each subdirectory?
I googled and found that the pkgutil could help, but it is not clear
how. Any hints?
Thanks in advance.

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Re: Automatic import of submodules

2011-11-25 Thread Dave Angel 

On 11/25/2011 08:00 AM, Massi wrote:

Hi everyone,

in my project I have the following directory structure:

plugins
 |
 -- wav_plug
   |
   -- __init__.py
   -- WavPlug.py
 -- mp3_plug
   |
   -- __init__.py
   -- Mp3Plug.py
...
 -- etc_plug
   |
   -- __init__.py
   -- EtcPlug.py

Every .py file contain a class definition whose name is identical to
to the file name, so in my main script I have to import each submodule
like that:

from plugins.wav_plug.WavPlug import WavPlug
from plugins.wav_plug.Mp3Plug import Mp3Plug

and so on. This is uncomfortable, since when a new plugin is added I
have to import it too. So my question is, is it possible to iterate
through the 'plugins' directory tree in order to automatically import
the submodules contained in each subdirectory?
I googled and found that the pkgutil could help, but it is not clear
how. Any hints?
Thanks in advance.

I think the key to the problem is the __import__() function, which takes 
a string and returns a module object.  So you make a list of the fully 
qualified module names (filenames less the extension), and loop through 
that list,  Then for each one, you can extract items from the module.


It doesn't make sense to define the class names at your top-level, 
though, since you'd not have any code to reference any new plugin if it 
has a unique class name. So at some point, you're probably going to have 
a list or map of such class objects.




--

DaveA

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Re: Automatic import of submodules

2011-11-25 Thread Jean-Michel Pichavant 

Massi wrote:

Hi everyone,

in my project I have the following directory structure:

plugins
|
-- wav_plug
  |
  -- __init__.py
  -- WavPlug.py
-- mp3_plug
  |
  -- __init__.py
  -- Mp3Plug.py
...
-- etc_plug
  |
  -- __init__.py
  -- EtcPlug.py

Every .py file contain a class definition whose name is identical to
to the file name, so in my main script I have to import each submodule
like that:

from plugins.wav_plug.WavPlug import WavPlug
from plugins.wav_plug.Mp3Plug import Mp3Plug

and so on. This is uncomfortable, since when a new plugin is added I
have to import it too. So my question is, is it possible to iterate
through the 'plugins' directory tree in order to automatically import
the submodules contained in each subdirectory?
I googled and found that the pkgutil could help, but it is not clear
how. Any hints?
Thanks in advance.

  

Hi,

Try something like (*untested code*)

plugins = {}
classes = {}

for plugin, className in [('wav_plug', 'WavPlug'), ('mp3_plug', 'Mp3Plug')]:
   plugins[plugin] = __import__(os.path.join('plugins', plugin, className))
   classes[className] = getattr(plugins[plugin], className)

# raise a keyError if the plugin has not been imported
wav = classes['wav_plug']()


Make sure all subdirs have the __init__.py file, including the plugins 
directory.


JM
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Re: Automatic import of submodules

2011-11-25 Thread alex23 
On Nov 25, 11:00 pm, Massi massi_...@msn.com wrote:
 plugins
     |
     -- wav_plug
           |
           -- __init__.py
           -- WavPlug.py
     -- mp3_plug
           |
           -- __init__.py
           -- Mp3Plug.py
 ...
     -- etc_plug
           |
           -- __init__.py
           -- EtcPlug.py

What do you gain by having each plugin as a package? Unless you're
storing other resources with each plugin, I'd move all your XXXPlug.py
files into plugins/ I'd also probably call the modules 'wavplug' and
the class 'WavPlug' to always make it clear  to which you're
referring.

 Every .py file contain a class definition whose name is identical to
 to the file name, so in my main script I have to import each submodule
 like that:

 from plugins.wav_plug.WavPlug import WavPlug
 from plugins.wav_plug.Mp3Plug import Mp3Plug

 and so on. This is uncomfortable, since when a new plugin is added I
 have to import it too. So my question is, is it possible to iterate
 through the 'plugins' directory tree in order to automatically import
 the submodules contained in each subdirectory?

It's not exactly automatic, but you could move all of those imports
into plugins/__init__.py, then just do a single

   from plugins import *

in your main module.
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