twisted logging to screen(stdout) not working

问题

i have this small program taken from here

from twisted.logger import Logger
log = Logger()

def handleData(data):
    log.debug("Got data: {data!r}.", data=data)

handleData({'a':20})

This does not prints anything to the screen .why is that?

回答1:

The default python logger is set to WARN level, so DEBUG messages are suppressed. You can make that code work like -

import logging
from twisted.logger import Logger
log = Logger()
log.setLevel(logging.DEBUG)

def handleData(data):
    log.debug("Got data: {data!r}.", data=data)

handleData({'a':20})

回答2:

i figured it out from here https://github.com/moira-alert/worker/blob/master/moira/logs.py:

import logging
from twisted.logger import Logger, LogLevel
import sys


from twisted.logger import globalLogPublisher
from twisted.logger import textFileLogObserver
from twisted.logger import FilteringLogObserver, LogLevelFilterPredicate, LogLevel



log = Logger()


level = LogLevel.debug
predicate = LogLevelFilterPredicate(defaultLogLevel=level)
observer = FilteringLogObserver(textFileLogObserver(sys.stdout), [predicate])
observer._encoding = "utf-8"
globalLogPublisher.addObserver(observer)
log.info("Start logging with {l}", l=level)

def handleData(data):
    log.debug("Got data: {data!r}.", data=data)

handleData({'a':20})

Is there any simpler way . it seems overly complicated just to set log level.

来源：https://stackoverflow.com/questions/57657962/twisted-logging-to-screenstdout-not-working