Create an import statement using variable "interpolation"
===

I have a long list of possible files I need to import.  I will only ever need 1 of them and they all have the same interface.  (Choosing a payment gateway to process a payment)

Suppose I have a dictionary that represents the name of all the gateway files.

i.e.

    gateways = {
       '1' : 'authorize',
       '2' : 'paysimple',
       '3' : 'braintreepayments',
       '4' : 'etc',
    }

I know the keys to this dictionary based on information from a database.  So, if I receive a payment process request with a gateway value of 1 I know it needs to be handled by Authorize.net.  A 2 is to be processed by Pay Simple.  Etc.

I'd like to be able to create an import statement that is built with the information I know rather than a horrible list of `elif` statements.

Consider the simple method below:

    # For the purposes of this example assume payment_gateway is defined
    # elsewhere and represents the key to the dictionary
    gateway_file = gateways.get(payment_gateway)
    
    import_str = "from gateway_interface.%s import process" % gateway_file
    gogo(import_str)


Where `gogo` is a way to cause the import statement to actually import.

Is such a thing possible?