如何使用Selenium检查属性的存在并获得其值？

Question

我迭代a google form survey并尝试放入一些内容（以防万一，我试图使其看起来像是引号）。但是某些字段是年龄的，不允许这样超过99岁：

<input type="text" class="quantumWizTextinputPaperinputInput exportInput" jsname="YPqjbf" autocomplete="off" tabindex="0" aria-label="Age" aria-describedby="i.desc.504994172 i.err.504994172" name="entry.128750970" value="" min="18" max="99" required="" dir="auto" data-initial-dir="auto" data-initial-value="10102015" badinput="false" aria-invalid="true">

所以我在代码中添加了一个条件，以尝试查看我必须在上面写的元素上是否有'max'属性：

        content_areas = driver.find_elements_by_class_name(
            "quantumWizTextinputSimpleinputInput.exportInput"
        )
        for content_area in content_areas:
            if content_area.get_attribute("max") exists:
                max = content_area.get_attribute("max")
                content_area.send_keys(max)
            else:
                content_area.send_keys("10102015")

但是它不起作用：

max:
Traceback (most recent call last):
  File "questions_scraper_michael.py", line 151, in <module>
    result = extract(driver, df, column)
  File "questions_scraper_michael.py", line 70, in extract
    "freebirdFormviewerViewNumberedItemContainer"
  File "C:\Users\antoi\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\selenium\webdriver\remote\webdriver.py", line 580, in find_elements_
by_class_name
    return self.find_elements(by=By.CLASS_NAME, value=name)
  File "C:\Users\antoi\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\selenium\webdriver\remote\webdriver.py", line 1007, in find_elements

    'value': value})['value'] or []
  File "C:\Users\antoi\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\selenium\webdriver\remote\webdriver.py", line 321, in execute
    self.error_handler.check_response(response)
  File "C:\Users\antoi\AppData\Local\Packages\PythonSoftwareFoundation.Python.3.7_qbz5n2kfra8p0\LocalCache\local-packages\Python37\site-packages\selenium\webdriver\remote\errorhandler.py", line 241, in check_respo
nse
    raise exception_class(message, screen, stacktrace, alert_text)
selenium.common.exceptions.UnexpectedAlertPresentException: Alert Text: {Alert text :
Message: unexpected alert open: {Alert text : }
  (Session info: chrome=83.0.4103.61)

Answer 1

我认为您的解决方案应该是这样

  content_areas = driver.find_elements_by_class_name(
            "quantumWizTextinputSimpleinputInput.exportInput"
        )
        for content_area in content_areas:
            if content_area.get_attribute("max") and not content_area..get_attribute("max").isspace():
                max = content_area.get_attribute("max")
            else:
                content_area.send_keys("10102015")

Answer 2

[python中没有“ exists”命令。您应该将其删除。

for content_area in content_areas:
    if content_area.get_attribute("max"):
        max = content_area.get_attribute("max")
    else:
        content_area.send_keys("10102015")