How do i instantiate a class_name passed via cmd line

Veek. M vek.m1234 at
Sat Feb 13 23:40:58 EST 2016

I'm writing a price parser. I need to do the equivalent of perl's
$$var to instantiate a class where $car is the class_name.

I'm passing 'Ebay' or 'Newegg' or 'Amazon' via cmd-line. I have a module 
named and a class called Ebay (price parser). I do something 

\> ebay motherboard

and this does: 
 module = __import__(module_name)
but now i need to instantiate the class - right now I do:
 instance = module.Ebay(module_name, product)

how do i replace the 'Ebay' bit with a variable so that I can load any 
class via cmd line.

class Load(object):
    def __init__(self, module_name, product):
            module = __import__(module_name)
            instance = module.Ebay(module_name, product)
        except ImportError:
            print("Can't find module %s" % module_name)

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