Get a list of logger names using python logging module

Question

I'm trying to get a list of logger names that have already been created. I saw a few similar questions on here but none of the answers produced the output I wanted. I want the list of names that you can use to call, logging.getLogger(name)

Thus the list would be...

* name1
* name2
* name3

Two things I have tried via the other questions..

loggers = [logging.getLogger(name) for name in logging.root.manager.loggerDict]
- Output - Logger name1 (DEBUG)>, <Logger name2 (DEBUG)
- This is the closest one as it contains the name within it
loggers = logging.getLogger().manager.loggerDict.keys()
- Output - generator object RsyncProcessing.start_new_filelist_update_process.<locals>.<genexpr> at 0x7fd193d43650

The reason I need just the list of names is because my program will run continuously and I only need to set up a new log if the log does not already exist. Therefore, I would write...

if name in loggers: 
     break 
else: 
     make_new_log

Loggers are singletons, so they don't get created multiple times for a given name. — Vinay Sajip
– Vinay Sajip, Commented Dec 13, 2019 at 8:16
see also How to list all existing loggers using python.logging module — milahu
– milahu, Commented Oct 16, 2023 at 13:10

blues · Accepted Answer · 2019-12-13 08:27:58Z

4

if name in logging.root.manager.loggerDict:
    print("logger already exists")

The loggerDict is just an ordinary dictionary. Your output suggests something else though, so are you sure you copied that correctly. Or alternatively, which version and implementation of python are you using?

Also as has been pointed out in the comments: calling getLogger is idempotent. Multiple calls with the same name will return the same object.

answered Dec 13, 2019 at 8:27

blues

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1 Comment

rayyyyychul Over a year ago

Thanks, that worked! I should have clarified that I have a log file for each station that I pick up, so will probably have ~250 log files and 1 general one.. therefore I call getLogger multiple times because I switch back and forth while they are updating to log to the appropriate file. If a new station comes online, then it will need to create a new log file for that station.

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