SeleniumPython代码中的”self”在做什么？

what “self” is doing in the selenium python code?

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Possible Duplicate:
Python ‘self’ explained

我刚刚在selenium文档的帮助下编写了下面的代码，但是我把它与self做的一些方法argument list混淆了。为什么我需要导入unittest类？

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import unittest
from selenium import webdriver
from selenium.webdriver.common.keys import Keys

class PythonOrgSearch(unittest.TestCase):

def setUp(self):
self.driver = webdriver.Firefox()

def test_search_in_python_org(self):
driver = self.driver
driver.get("http://www.python.org")
self.assertIn("Python", driver.title)
elem = driver.find_element_by_name("q")
elem.send_keys("selenium")
elem.send_keys(Keys.RETURN)
self.assertIn("Google", driver.title)

def tearDown(self):
self.driver.close()

if __name__ =="__main__":
unittest.main()