Loading classes dynamically

[Ramza Brown]

What is the most pythonic way to load a class and instaniate an object
dynamically. Right now, I am using eval:

try:
load = eval('%s(props) ' % (props['plugin.generat e']))
except:

It works, doesnt seem very safe. Where props['plugin.generat e'] is a
class name string. And 'props' is the first arg in the constructor.

What do you think?

--
Ramza from Atlanta

http://www.newspiritcompany.com

[Steven Bethard]

Re: Loading classes dynamically

Ramza Brown wrote:[color=blue]
> try:
> load = eval('%s(props) ' % (props['plugin.generat e']))
> except:
>
> It works, doesnt seem very safe. Where props['plugin.generat e'] is a
> class name string. And 'props' is the first arg in the constructor.[/color]

Where is the class defined? The right answer to this is usually
somethign like:

load = getattr(some_mo dule, props['plugin.generat e'])(props)

If the class is defined in the current module, another possibility is:

load = globals()[props['plugin.generat e']](props)

HTH,

STeVe