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.generate']))
except:

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

What do you think?

 

[Steven Bethard]

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

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

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

load = getattr(some_module, props['plugin.generate'])(props)

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

load = globals()[props['plugin.generate']](props)

HTH,

STeVe