显示等待报：selenium.webdriver.remote.webdriver.WebDriver.find_element() argument after * must be an itera

原因：visibility_of_element_located应该传一个可迭代对象，如元祖(By.XPATH, "//span[text()='保存凭证成功']")。不能传一个元素self.driver.find_element(By.XPATH, "//span[text()='保存凭证成功']")

错误写法：

svele = self.driver.find_element(By.XPATH, "//span[text()='保存凭证成功']")

WebDriverWait(self.driver, 5).until(EC.presence_of_element_located(svele))

正确写法：

svele = (By.XPATH, "//span[text()='保存凭证成功']")

WebDriverWait(self.driver, 5).until(EC.presence_of_element_located(svele))