How do I suppress console/cmd error messages in python

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How do I suppress error messages in python for chromedriver and pyinstaller exe?

I noticed that when I use chromedriver in pyinstaller and run it I get a list of error messages. I have been trying to remove them but no luck thus far. UPDATE: It seems the headless flag is causing a lot of grief.

DevTools listening on ws://127.0.0.1:12386/devtools/browser/74743659-2c28-45fb-bab4-3836bb91f383
[1213/214223.999:ERROR:service_manager.cc(157)] Connection InterfaceProviderSpec prevented service: content_renderer from binding interface: blink::mojom::ReportingServiceProxy exposed by: content_browser
Improvement, now how to remove this in headless.
Error messages:
DevTools listening on ws://127.0.0.1:12386/devtools/browser/74743659-2c28-45fb-bab4-3836bb91f383
[1213/214223.999:ERROR:service_manager.cc(157)] Connection InterfaceProviderSpec prevented service: content_renderer from binding interface: blink::mojom::ReportingServiceProxy exposed by: content_browser
[1213/214223.999:INFO:CONSOLE(4)] "Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help, check https://xhr.spec.whatwg.org/.", source: http://centrebet.com/Scripts/jquery-1.6.4.min.js (4)
[1213/214226.896:INFO:CONSOLE(42)] "Uncaught ReferenceError: $ is not defined", source: http://centrebet.com/Sports/8320572 (42)
[1213/214226.899:INFO:CONSOLE(60)] "Uncaught ReferenceError: bs_auto_expand is not defined", source: http://centrebet.com/Sports/8320572 (60)
[1213/214226.900:INFO:CONSOLE(65)] "Uncaught ReferenceError: gaPush is not defined", source: http://centrebet.com/Sports/8320572 (65)
[1213/214227.987:INFO:CONSOLE(112)] "Uncaught ReferenceError: $ is not defined", source: http://centrebet.com/Sports/71973868 (112)
[1213/214227.988:INFO:CONSOLE(174)] "Uncaught ReferenceError: addStaticBubble is not defined", source: http://centrebet.com/Sports/71973868 (174)
[1213/214227.989:INFO:CONSOLE(211)] "Uncaught ReferenceError: $ is not defined", source: http://centrebet.com/Sports/71973868 (211)
[1213/214227.991:INFO:CONSOLE(431)] "Uncaught ReferenceError: addStaticBubble is not defined", source: http://centrebet.com/Sports/71973868 (431)
[1213/214227.991:INFO:CONSOLE(468)] "Uncaught ReferenceError: $ is not defined", source: http://centrebet.com/Sports/71973868 (468)
[1213/214227.998:INFO:CONSOLE(688)] "Uncaught ReferenceError: addStaticBubble is not defined", source: http://centrebet.com/Sports/71973868 (688)
[1213/214227.998:INFO:CONSOLE(725)] "Uncaught ReferenceError: $ is not defined", source: http://centrebet.com/Sports/71973868 (725)
[1213/214228.001:INFO:CONSOLE(945)] "Uncaught ReferenceError: addStaticBubble is not defined", source: http://centrebet.com/Sports/71973868 (945)
[1213/214228.001:INFO:CONSOLE(982)] "Uncaught ReferenceError: $ is not defined", source: http://centrebet.com/Sports/71973868 (982)
[1213/214228.002:INFO:CONSOLE(1202)] "Uncaught ReferenceError: addStaticBubble is not defined", source: http://centrebet.com/Sports/71973868 (1202)
[1213/214228.003:INFO:CONSOLE(1239)] "Uncaught ReferenceError: $ is not defined", source: http://centrebet.com/Sports/71973868 (1239)
[1213/214228.004:INFO:CONSOLE(1459)] "Uncaught ReferenceError: addStaticBubble is not defined", source: http://centrebet.com/Sports/71973868 (1459)
[1213/214228.004:INFO:CONSOLE(1496)] "Uncaught ReferenceError: $ is not defined", source: http://centrebet.com/Sports/71973868 (1496)
[1213/214228.005:INFO:CONSOLE(1716)] "Uncaught ReferenceError: addStaticBubble is not defined", source: http://centrebet.com/Sports/71973868 (1716)
[1213/214228.005:INFO:CONSOLE(1753)] "Uncaught ReferenceError: $ is not defined", source: http://centrebet.com/Sports/71973868 (1753)
[1213/214228.006:INFO:CONSOLE(1973)] "Uncaught ReferenceError: addStaticBubble is not defined", source: http://centrebet.com/Sports/71973868 (1973)

Code:

options = Options()
options.add_argument('--headless')
options.add_argument('--hide-scrollbars')
options.add_argument('--disable-gpu')
driver = webdriver.Chrome(chrome_options=options)


url = "http://centrebet.com/"
driver.get(url)

def page_counter():
  for x in range(1000):
      yield x

count = page_counter()
driver.get(url)
sports = driver.find_element_by_id("accordionMenu1_ulSports")
links = [url + link.get_attribute("onclick").replace("menulink('", "").replace("')", "") for link in sports.find_elements_by_xpath('//ul[@id="accordionMenu1_ulSports"]//li//ul//li//ul//li//a[starts-with(@onclick, "menulink")]')]

links = dict((next(count) + 1, e) for e in links)

desc_links = collections.OrderedDict(sorted(links.items(), reverse=True))
for key, value in desc_links.items():
    driver.get(value)

What I have tried:

logging.disable(logging.CRITICAL)

logging.Logger.info = lambda *args, **kwargs: None

sys.stderr = os.devnull

logging.getLogger("requests").setLevel(logging.WARNING)

@contextmanager
def suppress_stdout():

    with open(os.devnull, "w") as devnull:
        old_stdout = sys.stdout
        sys.stdout = devnull
        try:
            yield
        finally:
            sys.stdout = old_stdout


import warnings

def fxn():
    warnings.warn("deprecated", DeprecationWarning)

with warnings.catch_warnings():
    warnings.simplefilter("ignore")
    fxn()

The error message appears to loop. Perhaps rewriting may fix...

Those logs are issued by Chrome. You can disable them by launching Chrome with the log level set to Fatal:

options = Options()
options.add_argument('--headless')
options.add_argument('--hide-scrollbars')
options.add_argument('--disable-gpu')
options.add_argument("--log-level=3")  # fatal
driver = webdriver.Chrome(chrome_options=options)

Though some messages are not filtered by this flag like DevTools listening on ....

To avoid them, you'll have to override the selenium.webdriver.common.service.Service and call subprocess.Popen with close_fds=True to avoid the inheritance of the file descriptor.

self.process = subprocess.Popen(cmd, env=self.env,
                                close_fds=True,
                                stdout=None,
                                stderr=None,
                                stdin=None)

Suppress Command Line Errors, When running a python script using nuke -t somePythonScript.py. And assigning the error of a read node to a variable Python System Command. While making a program in python, you may need to exeucte some shell commands for your program. For example, if you use Pycharm IDE, you may notice that there is option to share your project on github. And you probably know that file transferring is done by git, which is operated using command line. So, Pycharm executes

I had a similar problem and the following was my sollution. I was using the selenium module in a python script to open up chromedriver.exe and automate some online downloads. I run the script using a BAT file. Originally if I ran the BAT file, chrome was opened up and the files where downloaded, but the command line hanged on the log statement DevTools listening on ...

The way I got around this was in the bat file I added the line

taskkill /im chromedriver.exe /f

So my BAT file looked like this

python python_script.py
taskkill /im chromedriver.exe /f

The log statement still appears but killing chromedriver.exe seems to end the run.

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question now is how to remove error messages and suppress messages in relation to chrome driver

To switch off chromedriver logging, use DesiredCapabilities

options = Options()
options.add_argument('--headless')
options.add_argument('--hide-scrollbars')
options.add_argument('--disable-gpu')

dc = DesiredCapabilities.CHROME
dc['loggingPrefs'] = {'driver': 'OFF', 'server': 'OFF', 'browser': 'OFF'}

driver = webdriver.Chrome(chrome_options=options, desired_capabilities=dc)

See here for possible loggingPrefs values.

warnings — Warning control — Python 3.8.5 documentation, There are a number of built-in exceptions that represent warning categories. configured via the command line), then it is possible to suppress the warning� Have you ever wanted to temporarily suppress console output in Python? But you really want it to be temporary, even if an exception happens. Maybe you are calling into some idiot’s library who spams your console. Yeah, that’s happened to me before (maybe I was the idiot–I’m not tellin’).

Try this:-

options = webdriver.ChromeOptions();
options.add_experimental_option('excludeSwitches',['enable-logging']);

Hope it helps.

IDLE — Python 3.8.5 documentation, If no error, restart the shell to clean the environment, then execute the module. Output is Command Line Arguments extend sys.argv as if passed on a command line. The module can Show/Hide Code Context (Editor Window only) . Open a� In this step-by-step tutorial, you'll learn about the print() function in Python and discover some of its lesser-known features. Avoid common mistakes, take your "hello world" to the next level, and know when to use a better alternative.

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Comments
  • How can this be related to Selenium? Am I missing something?
  • @DebanjanB It is selenium script, but I remove tag.
  • Bring the tag back; those messages are being printed by the controlled browser noth python, so looking at the driver will be the easiest way to turn them off
  • @SamHartman Oh ok. I guess question now is how to remove error messages and suppress messages in relation to chrome driver.
  • Try changing sys.stdout = devnull to sys.stdout = os.devnull...
  • This tends to work well aside from DevTools listening on still persists for def methodA(self, arg1, arg2): self.process = subprocess.Popen
  • To override subprocess.Popen you'll have to update the source code of Selenium on your machine: PythonFolder\Lib\site-packages\selenium\webdriver\common\service.py. You can not override it in your script with def methodA(self, arg1, arg2): self.process = subprocess.Popen.
  • Uh I see. Unfortunately this did not remove it for me. Devtools listening on remains
  • There may not be way to disable. Lot of questions about disable ws but no answer: stackoverflow.com/questions/47417581/…
  • @The Gman, you are right, I though I got ride of the DevTools listening on by tweaking subprocess.Popen, but I I was just running the wrong script. It seems that Chrome is bypassing the provided file descriptor with no way to avoid it.
  • Is there a way to disable DevTools listening on ws:// as well or is this ingrained into cmd?
  • I filed an issue for this in Node.js, which does something similar: github.com/nodejs/node/issues/16515