How to use the prettytable.from_html function in prettytable

def testHtmlAndBack(self):
        html_string = self.x.get_html_string()
        new_table = from_html(html_string)[0]
        assert new_table.get_string() == self.x.get_string()

def printCourseTable(course):
    if course == '':
        return
    utils = Utils()
    url = utils.getUrl(course)
    if url == '':
        return
    if url.find('ocw.mit.edu') != -1:
        r = requests.get(url + '/calendar/')
        if r.status_code == 404:
            print 'page not found'
            return
        #table = prettytable.from_html(r.text)[2]
        for table in prettytable.from_html(r.text):
            if table.field_names[0] == 'Field 1':
                continue
            table.align['TOPICS'] = 'l'
            print table
    elif url.find('itunes.apple.com') != -1:
        r = requests.get(url)
        soup = BeautifulSoup(r.text)
        table = soup.find('table', class_='tracklist-table content sortable total-flexible-columns-2 total-columns-6')
        parser = TableHandler()
        parser.setMaxCellWidth(cell_width)
        parser.feed(table.prettify().replace('Video', ''))
        parser.tables[0].align["Name"] = "l"
        parser.tables[0].align["Description"] = "l"
        #print parser.tables[0].field_names
        #parser.tables[0].sortby = parser.tables[0].field_names[3]
        #parser.tables[0].reversesort = True