expected_conditions._find_element抛出一个错误：AttributeError的：“海峡”对象有没有属性“find_element”

Question

我要等待一些元素的外观，我用：

re_enter_email_field = WebDriverWait(self.driver, 10).until(
       expected_conditions._find_element(By.ID,"u_0_f")) 

但每次我运行一个测试，我得到一个错误：

Error 

    File "/home/akop/py_workspace/MacPaw_FB/pages/LoginPage.py", line 56, in submit_new_account_form 
    expected_conditions._find_element(By.ID,"u_0_f")) 
    File "/home/akop/py_workspace/t_sade_site/site_env/lib/python3.5/site-packages/selenium/webdriver/support/expected_conditions.py", line 398, in _find_element 
    return driver.find_element(*by) 
AttributeError: 'str' object has no attribute 'find_element' 

Answer 1

我知道你正在使用Python，但Java的我是这样做的：

new WebDriverWait(driver, EXPLICIT_TIMEOUT) 
      .until(new ExpectedCondition<Boolean>() { 
       public Boolean apply(WebDriver driver) { 
        return driver.findElements(By.id("my_id")).isEmpty(); 
       } 
      }); 

Answer 2

回答是容易得多：约(By.ID,"u_0_f")额外parenthes解决了这个问题

Answer 3

我不知道是什么意思是，这代码的，因为我有非常少的蟒蛇的知识，但它是不正确的我猜：

expected_conditions._find_element(By.ID,"u_0_f") 

但expected_conditions应具备的条件要遵循像element_to_be_clickable，presence_of_element_located或visibility_of_element_located等

你应该尝试这样

re_enter_email_field = WebDriverWait(driver, 10).until(
     expected_conditions.visibility_of_element_located(By.ID,"u_0_f")) 

或

re_enter_email_field = WebDriverWait(driver, 10).until(
     expected_conditions.presence_of_element_located(By.ID,"u_0_f")) 

或

re_enter_email_field = WebDriverWait(driver, 10).until(
     expected_conditions.element_to_be_clickable(By.ID,"u_0_f"))