functional_test.py and the error it produces

Python-Selenium-Errors

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

class NewVisitorTest(unittest.TestCase): #

   def setUp(self): #
     self.browser = webdriver.Firefox()
     self.browser.implicitly_wait(3)
   
   def tearDown(self): #
     self.browser.quit()
   
   def test_can_start_a_list_and_retrieve_it_later(self): # 

# Edith has heard about a cool new online to-do app. She goes
# to check out its homepage

     self.browser.get('http://localhost:8000')

# She notices the page title and header mention to-do lists
     self.assertIn ('To-Do',self.browser.title)#
     header_text = self.browser.find_element_by_tag_name('h1')#.test
     self.assertIn('To-Do', header_text)
     

# She is invited to enter a to-do item straight away
     inputbox = self.browser.find_element_by_id('id_new_items')
     self.assertEqual(
		inputbox.get_attribute('placeholder'),
		'Enter a to-do item'
     )

# She types "Buy peacock feathers" into a text box (Edith's hobby
# is tying fly-fishing lures) 
     inputbox.send_keys('Buy peacock feathers')


# When she hits enter, the page updates, and now the page lists
# "1: Buy peacock feathers" as an item in a to-do list
     inputbox.send_keys(keys.ENTER)

     table = self.browser.find_element_by_id('id_list_table')
     rows = table.find_elements_by_tag_name('tr')
     self.assertTrue(
		any(row.text == '1: Buy peacock feathers' for row in rows),
		"New to-do item did not appear in table"
     )

# There is still a text box inviting her to add another item. She
# enters "Use peacock feathers to make a fly" (Edith is very
# methodical)
     self.fail('Finish the test!') #

# The page updates again, and now shows both items on her list

# Edith wonders whether the site will remember her list. Then she sees
# that the site has generated a unique URL for her --there is some
# explanatory text to that effect.

# She visits that URL -her to-do list is still there.

# Satisfied, she goes back to sleep

# browser.quit() 

if __name__ == '__main__': #
   unittest.main(warnings='ignore') #



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chintani@chintani-HP-Mini-110-3000:~/Documents/webapps-projects/superlists$ python3 functional_tests.py
E
======================================================================
ERROR: test_can_start_a_list_and_retrieve_it_later (__main__.NewVisitorTest)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "functional_tests.py", line 24, in test_can_start_a_list_and_retrieve_it_later
    self.assertIn('To-Do', header_text)
  File "/usr/lib/python3.4/unittest/case.py", line 1050, in assertIn
    if member not in container:
TypeError: argument of type 'WebElement' is not iterable

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Ran 1 test in 20.968s