Selenium:无法使用python截屏元素

Question

所以我浏览了文档，并试图使用截屏一个元素

wd = webdriver.Chrome(chrome_path, chrome_options=options)
url = "https://results.vtu.ac.in/AS_CBCS/index.php"
wd.get(url)
img = wd.find_element_by_xpath('//img[@alt="CAPTCHA code"]')
img.screenshot('foo.png')

但我得到了错误：

WebDriverException：消息：未知命令：session/64908e933eb1a91d71fe794e239f1687/element/0.903743608717787-2/屏幕截图

WebDriverException                        Traceback (most recent call last)
<ipython-input-41-4474be757d45> in <module>()
10 
11 
---> 12 img.screenshot('foo.png')
c:usershimanshu poddarappdatalocalprogramspythonpython36-32libsite-packagesseleniumwebdriverremotewebelement.py in screenshot(self, filename)
451             warnings.warn("name used for saved screenshot does not match file "
452                           "type. It should end with a `.png` extension", UserWarning)
--> 453         png = self.screenshot_as_png
454         try:
455             with open(filename, 'wb') as f:
c:usershimanshu poddarappdatalocalprogramspythonpython36-32libsite-packagesseleniumwebdriverremotewebelement.py in screenshot_as_png(self)
433             element_png = element.screenshot_as_png
434         """
--> 435         return base64.b64decode(self.screenshot_as_base64.encode('ascii'))
436 
437     def screenshot(self, filename):
c:usershimanshu poddarappdatalocalprogramspythonpython36-32libsite-packagesseleniumwebdriverremotewebelement.py in screenshot_as_base64(self)
423             img_b64 = element.screenshot_as_base64
424         """
--> 425         return self._execute(Command.ELEMENT_SCREENSHOT)['value']
426 
427     @property
c:usershimanshu poddarappdatalocalprogramspythonpython36-32libsite-packagesseleniumwebdriverremotewebelement.py in _execute(self, command, params)
499             params = {}
500         params['id'] = self._id
--> 501         return self._parent.execute(command, params)
502 
503     def find_element(self, by=By.ID, value=None):
c:usershimanshu poddarappdatalocalprogramspythonpython36-32libsite-packagesseleniumwebdriverremotewebdriver.py in execute(self, driver_command, params)
309         response = self.command_executor.execute(driver_command, params)
310         if response:
--> 311             self.error_handler.check_response(response)
312             response['value'] = self._unwrap_value(
313                 response.get('value', None))
c:usershimanshu poddarappdatalocalprogramspythonpython36-32libsite-packagesseleniumwebdriverremoteerrorhandler.py in check_response(self, response)
206             if exception_class == ErrorInResponseException:
207                 raise exception_class(response, value)
--> 208             raise exception_class(value)
209         if message == "" and 'message' in value:
210             message = value['message']
WebDriverException: Message: unknown command: session/7446082ee2eab255d16e7ac489d4b9b1/element/0.7847029784212665-2/screenshot

s.screenshot('screenshot.png')
---------------------------------------------------------------------------
WebDriverException                        Traceback (most recent call last)
<ipython-input-29-53a118d5bd49> in <module>()
----> 1 s.screenshot('screenshot.png')
c:usershimanshu poddarappdatalocalprogramspythonpython36-32libsite-packagesseleniumwebdriverremotewebelement.py in screenshot(self, filename)
451             warnings.warn("name used for saved screenshot does not match file "
452                           "type. It should end with a `.png` extension", UserWarning)
--> 453         png = self.screenshot_as_png
454         try:
455             with open(filename, 'wb') as f:
c:usershimanshu poddarappdatalocalprogramspythonpython36-32libsite-packagesseleniumwebdriverremotewebelement.py in screenshot_as_png(self)
433             element_png = element.screenshot_as_png
434         """
--> 435         return base64.b64decode(self.screenshot_as_base64.encode('ascii'))
436 
437     def screenshot(self, filename):
c:usershimanshu poddarappdatalocalprogramspythonpython36-32libsite-packagesseleniumwebdriverremotewebelement.py in screenshot_as_base64(self)
423             img_b64 = element.screenshot_as_base64
424         """
--> 425         return self._execute(Command.ELEMENT_SCREENSHOT)['value']
426 
427     @property
c:usershimanshu poddarappdatalocalprogramspythonpython36-32libsite-packagesseleniumwebdriverremotewebelement.py in _execute(self, command, params)
499             params = {}
500         params['id'] = self._id
--> 501         return self._parent.execute(command, params)
502 
503     def find_element(self, by=By.ID, value=None):
c:usershimanshu poddarappdatalocalprogramspythonpython36-32libsite-packagesseleniumwebdriverremotewebdriver.py in execute(self, driver_command, params)
309         response = self.command_executor.execute(driver_command, params)
310         if response:
--> 311             self.error_handler.check_response(response)
312             response['value'] = self._unwrap_value(
313                 response.get('value', None))
c:usershimanshu poddarappdatalocalprogramspythonpython36-32libsite-packagesseleniumwebdriverremoteerrorhandler.py in check_response(self, response)
206             if exception_class == ErrorInResponseException:
207                 raise exception_class(response, value)
--> 208             raise exception_class(value)
209         if message == "" and 'message' in value:
210             message = value['message']
WebDriverException: Message: unknown command: session/64908e933eb1a91d71fe794e239f1687/element/0.8903743608717787-2/screenshot

Answer 1

Chrome version : 85.0.4183.121 (Official Build) (64-bit)
Chrome driver version :  2.38.552522

因此，安装并更新我的chrome驱动程序版本到(85.X.X.X(解决了我的问题。