element = WebDriverWait(driver,5,0.5).until(
Ec.presence_of_element_located((By.ID,"kw"))
)
这个代码中：Ec.presence_of_element_located((By.ID,"kw"))这里为什么会有两层括号，无法理解，不是应该是Ec.presence_of_element_located(By.ID,"kw")么？有木有人给解释一下