selenium error "WebElement object has no attribute 'sendKeys'

selenium 访问一个form的title，总是报错如题：

WebElement object has no attribute 'sendKeys' [duplicate]

@when ('I enter "(.*)" in the "(.*)" field')
def step_impl(context,content,filed_name):
    post_page = Post_Page(context.driver)
    post_page.form_field(filed_name).send_Keys(content)

找了好几个方法都不管用：

1.   post_page.form_field(filed_name).send_Keys(content) 改成：form_field = post_page.form_field(filed_name) ; form_field.send_Keys(content)

2.  import module :  from selenium.webdriver.common.keys import Keys

3. 然后这个方法总算管用，原因未知。

Input1 = browser.find_element_by_xpath('//*[@id="login-dialog dialog"]/div[2]/div[2]/div[2]/form/div[1]/input')

actions = ActionChains(driver) actions.move_to_element(input1).send_keys("myusername").perform()