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Is there an easy way to add handlers to the logger object?


Is there an easy way to add handlers to the logger object?

By : user2952951
Date : November 19 2020, 03:59 PM
Hope that helps Well, As can be seen in the source code, the handlers need to be added safely (notice _acquireLock() and _releaseLock() because a logger can be shared.
What you could do is the following:
code :
logger.handlers.extend([file_log_handler, stderr_handler])
def add_many_handlers(logger, handler_list):
    for handler in handler_list:
        logger.addHandler(handler)
def addHandler(self, hdlr):
    """
    Add the specified handler to this logger.
    """
    _acquireLock()
    try:
        if not (hdlr in self.handlers):
            self.handlers.append(hdlr)
    finally:
        _releaseLock()


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Can I use Logger.log(Object format, Object...values):Logger in place of Logger.log(message)?

Can I use Logger.log(Object format, Object...values):Logger in place of Logger.log(message)?


By : Sergio Cristaldo
Date : March 29 2020, 07:55 AM
Any of those help You can continue to use Logger.log(message) as they have it retained for backward compatibility. And keep watching the release notes to hear more about the new options.
Python logger debuging: No handlers could be found for logger "__main__"

Python logger debuging: No handlers could be found for logger "__main__"


By : user3167633
Date : March 29 2020, 07:55 AM
it should still fix some issue I have a plivo conference call application. I am able to run the app fine locally, but when I run on heroku I am receiving the following error, which kills my app: 2015-02-12T05:36:08.173658+00:00 app[web.1]: No handlers could be found for logger "__main__" 2015-02-12T05:36:08.173695+00:00 app[web.1]: Pilvo error: CombinedMultiDict([ImmutableMultiDict([]), ImmutableMultiDict([('From', u'zzzphone'), ('Direction', u'inbound'), ('BillRate', u'0.00850'), ('CallerName', u'+yyyphone'), ('To', u'xxxphone'), ('CallStatus', u'ringing'), ('CallUUID', u'0aaf7442-b279-11e4-af9d-ff55a7d29b8a'), ('Event', u'StartApp')])]) , , Are you using flask?
If so, try calling logger from the app:
No handlers could be found for logger

No handlers could be found for logger


By : hameierjuri
Date : March 29 2020, 07:55 AM
it helps some times For logging some message through logger, in Python at least one handler should be added to the logger object. By default the debug, warn and other functions in logging module will call basicConfig which in turn will add a StreamHandler to the root logger.
It's always recommended to add your required Handler to your logger object you are writing for your module.
code :
import logging
import inspect
print(inspect.getsource(logging))
import logging
logging.basicConfig()
logger = logging.getLogger('logger')
logger.warning('The system may break down')
How can logger.removeHandler(logger.handlers[0]) throw ValueError: list.remove(x): x not in list?

How can logger.removeHandler(logger.handlers[0]) throw ValueError: list.remove(x): x not in list?


By : Tzh Ttl
Date : March 29 2020, 07:55 AM
hope this fix your issue While individual operations may be atomic (along with operations such as list.remove as you may have noted, but this is only due to implementation details of CPython), removeHandler certainly is not. In the Python 2.6 implementation (which you have very helpfully posted), the context switch can happen after the if statement and before the lock acquisition (assuming that is what hdlr.acquire() does). So if two threads called this function at the same time, it is guaranteed to cause an exception when one thread subsequently released its hold on GIL as the other runs through the entire thing to completion (original thread will continue from inside the if, handler is still pointing to the original one, which will acquire the IO lock, then tries to remove it from the list, causing an unwanted exception).
In Python 2.7, this has been fixed and the removeHandler method was changed to this:
code :
    def removeHandler(self, hdlr):
        """
        Remove the specified handler from this logger.
        """
        _acquireLock()
        try:
            if hdlr in self.handlers:
                self.handlers.remove(hdlr)
        finally:
            _releaseLock()
No handlers could be found for logger

No handlers could be found for logger


By : Uday Kiran
Date : March 29 2020, 07:55 AM
Hope that helps The docs are a little unclear about this, but when you use the built-in functionality for specifying logging settings, you don't need to get an instance of the logger.
You would simply do the following:
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