Python 如何使用Selenium';等等?
我很难弄清楚如何使用Selenium的等待函数。我要做的是检查元素是否存在,如果存在,它将打印一条语句。这是我的密码:Python 如何使用Selenium';等等?,python,selenium,Python,Selenium,我很难弄清楚如何使用Selenium的等待函数。我要做的是检查元素是否存在,如果存在,它将打印一条语句。这是我的密码: from selenium import webdriver from selenium.webdriver.support.ui import WebDriverWait from selenium.webdriver.support import expected_conditions as EC from selenium.common.exceptions import
from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from selenium.common.exceptions import TimeoutException
browser = webdriver.Firefox()
browser.get("http://google.com")
delay = 3 # seconds
try:
WebDriverWait(browser, delay).until(EC.presence_of_element_located(browser.find_element_by_xpath('//*[@id="hplogo"]')))
print ("Page is ready!")
except TimeoutException:
print ("Loading took too much time!")
当前代码给了我以下错误:
Traceback (most recent call last):
File "/Users/John/Documents/waitTest.py", line 10, in <module>
WebDriverWait(browser, delay).until(EC.presence_of_element_located(browser.find_element_by_xpath('//*[@id="hplogo"]')))
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/selenium/webdriver/support/wait.py", line 71, in until
value = method(self._driver)
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/selenium/webdriver/support/expected_conditions.py", line 59, in __call__
return _find_element(driver, self.locator)
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/selenium/webdriver/support/expected_conditions.py", line 274, in _find_element
return driver.find_element(*by)
TypeError: find_element() argument after * must be a sequence, not WebElement
回溯(最近一次呼叫最后一次):
文件“/Users/John/Documents/waitTest.py”,第10行,在
WebDriverWait(浏览器,延迟)。直到(EC.presence_of_element_located(browser.find_element_by_xpath('/*[@id=“hplogo”]'))
文件“/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/selenium/webdriver/support/wait.py”,第71行,直到
值=方法(自身驱动程序)
文件“/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site packages/selenium/webdriver/support/expected_conditions.py”,第59行,在uu调用中__
return\u find\u元素(驱动程序、self.locator)
文件“/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site packages/selenium/webdriver/support/expected_conditions.py”,第274行,在_find_元素中
返回驱动程序。查找元素(*by)
TypeError:find_element()参数在*之后必须是序列,而不是WebElement
预期条件要传入的元组,其中第一项是定位器的类型(By
常量),第二项是定位器的值:
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
wait = WebDriverWait(browser, 10)
wait.until(EC.presence_of_element_located((By.XPATH, '//*[@id="hplogo"]')))
请注意,在您的情况下,By.ID
会更简单:
wait.until(EC.presence_of_element_located((By.ID, 'hplogo')))
您需要通过模块导入
from selenium.webdriver.common.by import By
从selenium从selenium.webdriver.support.ui导入WebDriverWait从selenium.webdriver.support导入预期的_条件作为EC从selenium.common.exceptions导入TimeoutException browser=webdriver.Firefox()browser.get(“http://google.com)延迟=3秒尝试:等待=WebDriverWait(浏览器,10)等待.until(EC.presence\u of_element\u located(('by.id','hplogo'))打印(“页面已准备就绪!”),TimeoutException除外:打印(“加载花费了太多时间!”)
它没有打印第一次打印,但它确实会等待延迟并打印第二次。@JohnPham不记得曾建议您使用'by.id'
。将其作为by.id会出现以下错误:raceback(最后一次调用):File./Users/John/Documents/waitTest.py),第11行,在wait.until中(EC.presence\u of_element\u)((By.ID,'hplogo'))名称错误:未定义名称“By”