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How do i instantiate a class_name passed via cmd line

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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 ebay.py and a class called Ebay (price parser). I do something 
like:

\> main.py 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):
        try:
            module = __import__(module_name)
            instance = module.Ebay(module_name, product)
        except ImportError:
            print("Can't find module %s" % module_name)

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How do i instantiate a class_name passed via cmd line "Veek. M" <vek.m1234@gmail.com> - 2016-02-14 10:10 +0530
  Re: How do i instantiate a class_name passed via cmd line Rick Johnson <rantingrickjohnson@gmail.com> - 2016-02-13 21:31 -0800
    Re: How do i instantiate a class_name passed via cmd line "Veek. M" <vek.m1234@gmail.com> - 2016-02-14 11:09 +0530
      Re: How do i instantiate a class_name passed via cmd line Rick Johnson <rantingrickjohnson@gmail.com> - 2016-02-13 21:55 -0800
  Re: How do i instantiate a class_name passed via cmd line Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2016-02-14 18:41 +1300
    Re: How do i instantiate a class_name passed via cmd line "Veek. M" <vek.m1234@gmail.com> - 2016-02-14 11:21 +0530
    Re: How do i instantiate a class_name passed via cmd line Peter Otten <__peter__@web.de> - 2016-02-14 14:48 +0100
  Re: How do i instantiate a class_name passed via cmd line Cameron Simpson <cs@zip.com.au> - 2016-02-14 16:20 +1100

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