I have 10+ test cases at the moment and planning on creating several more. That being said is there a way that I can modify the URL variable once and that would change the variable in all my other scripts? I have this in all my of test scripts:
class TestCase1(unittest.TestCase):
    def setUp(self):
        self.driver = webdriver.Firefox()
        self.driver.implicitly_wait(30)
        self.base_url = "http://URL"
        self.verificationErrors = []
        self.accept_next_alert = True

I want to be able to be able to modify self.base_url = http://URL. But I don't want to have to do that 10+ times.
There are 2 good approaches to doing this,
1) Using a Configuration Manager, a singleton object that stores all your settings.
2) Using a basetest, a single base test that all your tests inherit from.
My preference is towards a Configuration Manager.  And within that configuration manager, you can put your logic for grabbing the base url form configuration files, system environments, command line params, etc...
Python Selenium Having to Change URL Variable On All of My Test Cases