def test_search(self):
        """test search"""
        header_obj = header.Header(self.driver)
        #open search form
        assert header_obj.click_search(), "search form is unavailable"
        #try to search by keyword having not empty results
        header_obj.run_search('renault')
        #check search found specific article
        assert (header_obj.search_results_general() != "true") , 'nothing found, expected several news in results'

         self.search_class = 'icon-search'
        self.search_field = '//div[@class="header-search-block js-search-tabs open-search-block"]//' \
                                  'input[@placeholder="Введите текст для поиска"]'
        self.run_search = 'input[placeholder="Введите текст для поиска"]'
        self.search_res_empty = 'search-page-result__not-found'

     def click_search(self):
        # click magnifier icon
        self.driver.find_element_by_class_name(self.search_class).click()
        return self.driver.find_element_by_xpath(self.search_field)
    def run_search(self, keyword):
        search_field = self.driver.find_element_by_css_selector(self.search_field)
        search_field.clear()
        search_field.send_keys(keyword)
        search_field.send_keys(Keys.ENTER)
    def search_results_general(self):
        return self.driver.find_element_by_class_name(self.search_res_empty)

    File "D:\git\Site_AT\test_header.py", line 52, in test_search
    header_obj.run_search()
TypeError: 'str' object is not callable

 self.run_search
def run_search(self, keyword):