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Benjamin |
at Dec 30, 2007 at 2:45 pm
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On Dec 30, 8:24 am, marcroy.ol... at gmail.com wrote:
Hi list and python gurus :-)
I'm playing with some mod_python and web development. And in me code I
need to do som dynamic imports.
Right now I just do a:
exec 'import '+some_modulename
The correct way to do this is use the __import__ function. It takes
the string name of the module you want to import and returns the
module.
new_mod = __import__(some_modulename)
But it seems to easy, is there a "dark side" to doing it this way?
(memory use,processing ,etc)
Well, it's generally frowned on to use exec and eval.
And have to I check if the modul is already loaded?
sys.modules is a list of all imported modules, but python won't import
a module if it's already been loaded.
Another thing is how to call my dynamic imported moduls.
Now I use exec (as with my modules), like this:
exec 'newclass = '+classname+'()'
newclass.somefunction()
Again it seems to easy. Is there a better/proper way to do it?
If you just have the string name of a class, you have to use eval or
exec:
newclass = eval(classname)
However, if you have the class object, you can just instantiate that:
class LargeClass:
def meth(): pass
some_class = LargeClass
new_class = some_class()
some_class.meth()
Do anybody now a good howto or tutorial to this?
Many thanks and hope you all have a happy new year :-) You, too!
/marc
