Is there a selenium close browser option at the end of a selenium test?

You're actually creating a second Selenium close browser session in your tearDown() function. You need to put the session created in setUp() into an instance variable, then close that session in tearDown().

class TestFoo(unittest.TestCase):
    def setUp(self):
        self.selenium = selenium('localhost', 4444, "*chrome", 'http://blackpearl/')
        self.selenium.start()
    def tearDown(self):
        self.selenium.stop()
    def test_bar(self):
        self.selenium.open("/somepage")
        #and so forth