selenium：超过 url 的最大重试次数

Question

完整追溯：

Traceback (most recent call last):
  File "/home/webadmin/dev.taracares.com/src/app_payroll_reports/tests.py", line 134, in test_mstnla_sums_incentives_tennessee_sum
    int(quince_amount_cell.text.replace(',', '')) +
  File "/home/webadmin/dev.taracares.com/dev/lib/python3.8/site-packages/selenium/webdriver/remote/webelement.py", line 77, in text
    return self._execute(Command.GET_ELEMENT_TEXT)['value']
  File "/home/webadmin/dev.taracares.com/dev/lib/python3.8/site-packages/selenium/webdriver/remote/webelement.py", line 710, in _execute
    return self._parent.execute(command, params)
  File "/home/webadmin/dev.taracares.com/dev/lib/python3.8/site-packages/selenium/webdriver/remote/webdriver.py", line 423, in execute
    response = self.command_executor.execute(driver_command, params)
  File "/home/webadmin/dev.taracares.com/dev/lib/python3.8/site-packages/selenium/webdriver/remote/remote_connection.py", line 333, in execute
    return self._request(command_info[0], url, body=data)
  File "/home/webadmin/dev.taracares.com/dev/lib/python3.8/site-packages/selenium/webdriver/remote/remote_connection.py", line 355, in _request
    resp = self._conn.request(method, url, body=body, headers=headers)
  File "/home/webadmin/dev.taracares.com/dev/lib/python3.8/site-packages/urllib3/request.py", line 74, in request
    return self.request_encode_url(
  File "/home/webadmin/dev.taracares.com/dev/lib/python3.8/site-packages/urllib3/request.py", line 96, in request_encode_url
    return self.urlopen(method, url, **extra_kw)
  File "/home/webadmin/dev.taracares.com/dev/lib/python3.8/site-packages/urllib3/poolmanager.py", line 375, in urlopen
    response = conn.urlopen(method, u.request_uri, **kw)
  File "/home/webadmin/dev.taracares.com/dev/lib/python3.8/site-packages/urllib3/connectionpool.py", line 783, in urlopen
    return self.urlopen(
  File "/home/webadmin/dev.taracares.com/dev/lib/python3.8/site-packages/urllib3/connectionpool.py", line 783, in urlopen
    return self.urlopen(
  File "/home/webadmin/dev.taracares.com/dev/lib/python3.8/site-packages/urllib3/connectionpool.py", line 783, in urlopen
    return self.urlopen(
  File "/home/webadmin/dev.taracares.com/dev/lib/python3.8/site-packages/urllib3/connectionpool.py", line 755, in urlopen
    retries = retries.increment(
  File "/home/webadmin/dev.taracares.com/dev/lib/python3.8/site-packages/urllib3/util/retry.py", line 574, in increment
    raise MaxRetryError(_pool, url, error or ResponseError(cause))
urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='localhost', port=58331): Max retries exceeded with url: /session/0f8192d1-c39f-49d1-9a99-7f91dfe95481/element/a5dd2645-6c15-44dc-b000-04bf6b7ea6cb/text (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7fd9dcde24f0>: Failed to establish a new connection: [Errno 111] Connection refused'))

这是在 django 应用程序测试中运行的代码。测试过去运行良好，现在最后 4 个测试（使用 selenium）出现错误，这是在我在每次测试后添加

driver.quit()

后开始的。

不过这很奇怪。以下是运行每个（最后四个）测试的相关代码：

    options = webdriver.FirefoxOptions()
    options.add_argument("--headless")

    driver = webdriver.Firefox(options=options)

    driver.get('https://dev.taracares.com/pr-run-ppe?group=MS%2FTN%2FLA&check_date=05%2F01%2F2022')

    # some selenium code

    driver.quit()

发生什么事了？

Answer 1

确保 quit 实际上位于代码的底部。出错的命令是获取元素的文本。您似乎已退出驱动程序，然后尝试调用以获取与该驱动程序会话关联的元素的文本。

Answer 2

应为

driver.quit()

方法等保存诸如

tearDown()

之类的行。这样，如果测试提前结束/失败，它仍然会被调用，并且当您可能仍然需要驱动程序时，它不会被太快调用，比如打电话

.text()

时，需要司机仍然开着。

许多现有的 Python 框架已经有一个

tearDown()

部分，您可以在其中放置

driver.quit()

（例如继承

unittest.TestCase

的类），或者它可以是

pytest

固定装置的一部分（例如

pytest_runtest_teardown

） ）。一些结合 Python/Selenium 的框架会在测试结束时自动为您关闭驱动程序（例如 SeleniumBase），从而节省您这一步。完全披露：我是 SeleniumBase 的作者/维护者。