Dynamic Loading Modules

[Laszlo Nagy]

Riley Porter írta:
> Hello all,
>
> This is the first time I have posted to this group.  That being said 
> if I am in the wrong place for this kind of support please let me know. 
>
> OK,
>
> So I am writing a log parsing program and wish to allow for the 
> community to write "parsers".  Basically, what I have in place now is 
> a "modules" directory that contains .py files that are going to be 
> used to parse specific log types. 
>
> The question is, is there a way to dynamically import whatever is in 
> that modules directory and make is to the import name is actually the 
> file name..
> So after the modules directory is 'os.listdir' and it returns a 
> listing of modules (actually just .py files) IE: ng1-fw.py, 
> cisco_asa_fw.py, etc... I can just in the next line of code call:
>
> ng1-fw.Parse(long_file)  #assuming the ng1-fw.py file has a Parse Function
>
> right now using imp I got it to where i can say like:
> x =  imp.load_source(md5.new(code_path).hexdigest(), code_path, f)  
> #assuming that I gave it the path and filename for ng1-fw.py
> I can do this:
>
> x.Parse(log_file)
>
> But what I am really after is the ability to do this:
> ng1-fw.Parse(log_file) 
>
> The reason again behind this is so that there is no need to "hard 
> code" parser file names. 
>
> Did I make myself clear?  Please let me know if I need to explain that 
> better.
What you need is the imp module:

http://docs.python.org/library/imp.html

> This module provides an interface to the mechanisms used to implement 
> the import <http://docs.python.org/reference/simple_stmts.html#import> 
> statement. It defines the following constants and functions:


You might find that using classes instead of modules is more handy.

Regards,

   Laszlo