En Sun, 30 Dec 2007 12:24:53 -0200, <[EMAIL PROTECTED]> escribi�: > 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 > > But it seems to easy, is there a "dark side" to doing it this way? > (memory use,processing ,etc)
Use __import__, specially if some_modulename comes from the outside. What if some_modulename contains "modulename\nsome_nasty_function_call()" > And have to I check if the modul is already loaded? Not needed; the standard import machinery already does that. > 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? Use getattr to obtain the desired class from the containing module, then use it as any other class: the_module = __import__(some_modulename) the_class = getattr(the_module, classname) o = the_class() o.somefunction() Never use exec/eval and friends - and never ever use them in a web application! > Do anybody now a good howto or tutorial to this? No... what do you want covered? > Many thanks and hope you all have a happy new year :-) Thanks, and a happy new year for you too! -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
