Mailing List Archive: Using loguru in a library

Using loguru in a library

Apr 30, 2023, 8:40 AM

Post #1 of 5 (182 views)

Is there anyone using loguru (loguru 0.5.3 in my case) successfully in a
library?

In my __init__.py in mylib I do

logger.disable('mylib')

which definitely works. I don't get any more logging.

I "pip install ." the library, then in mytest.py I do

import mylib
logger.enable('mylib')

expecting that it would report any log messages above level DEBUG, just
as it does when I don't disable logging. Unfortunately it doesn't
have any effect; it doesn't report any logging from mylib.

I have verified that __name__ is visible in the library and is 'mylib'.

I would also have expected that logger.enable(None) would turn all the
logging on everywhere but it seems not.

I have probably misunderstood how logger.enable() is supposed to be
used. Can anyone share a brief example?

Roy
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Re: Using loguru in a library [ In reply to ]

python at mrabarnett

May 1, 2023, 9:59 AM

Post #2 of 5 (182 views)

Permalink

On 2023-04-30 16:40, Roy Hann wrote:
> Is there anyone using loguru (loguru 0.5.3 in my case) successfully in a
> library?
>
>
> In my __init__.py in mylib I do
>
> logger.disable('mylib')
>
> which definitely works. I don't get any more logging.
>
> I "pip install ." the library, then in mytest.py I do
>
> import mylib
> logger.enable('mylib')
>
> expecting that it would report any log messages above level DEBUG, just
> as it does when I don't disable logging. Unfortunately it doesn't
> have any effect; it doesn't report any logging from mylib.
>
> I have verified that __name__ is visible in the library and is 'mylib'.
>
> I would also have expected that logger.enable(None) would turn all the
> logging on everywhere but it seems not.
>
> I have probably misunderstood how logger.enable() is supposed to be
> used. Can anyone share a brief example?
>
According to the docs, the argument is the name of the module.

In your example, the name of the module (i.e. file) is "__init__";
"mylib" is the name of the package.
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Re: Using loguru in a library [ In reply to ]

specially at processed

May 2, 2023, 1:17 AM

Post #3 of 5 (181 views)

Permalink

MRAB wrote:

> On 2023-04-30 16:40, Roy Hann wrote:
>> Is there anyone using loguru (loguru 0.5.3 in my case) successfully in a
>> library?
>>
>>
>> In my __init__.py in mylib I do
>>
>> logger.disable('mylib')
>>
>> which definitely works. I don't get any more logging.
>>
>> I "pip install ." the library, then in mytest.py I do
>>
>> import mylib
>> logger.enable('mylib')
>>
>> expecting that it would report any log messages above level DEBUG, just
>> as it does when I don't disable logging. Unfortunately it doesn't
>> have any effect; it doesn't report any logging from mylib.
>>
>> I have verified that __name__ is visible in the library and is 'mylib'.
>>
>> I would also have expected that logger.enable(None) would turn all the
>> logging on everywhere but it seems not.
>>
>> I have probably misunderstood how logger.enable() is supposed to be
>> used. Can anyone share a brief example?
>>
> According to the docs, the argument is the name of the module.
>
> In your example, the name of the module (i.e. file) is "__init__";
> "mylib" is the name of the package.

Thanks for taking a look at this. I will continue to play around with
it using your suggestion, but according to the snippets and recipes
for loguru at
https://loguru.readthedocs.io/en/stable/resources/recipes.html#configuring-loguru-to-be-used-by-a-library-or-an-application
I need to refer to the package name in disable() in __init__.py, not the
module/file name, and so I expect to use it in enable() in my main.
Also, as mentioned, I have already verified that __name__ in my
package is referring to the package name not the module.

Since every package will have a __init__.py even if it's empty, using
the module name to control logging by package would be difficult.

Or so I say. My code isn't working so I am wrong about some or all
of this. I'll keep tinkering and looking out for advice/suggestions
here.

Roy

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Re: Using loguru in a library [ In reply to ]

dieter at handshake

May 2, 2023, 9:26 AM

Post #4 of 5 (181 views)

Permalink

Roy Hann wrote at 2023-4-30 15:40 -0000:
>Is there anyone using loguru (loguru 0.5.3 in my case) successfully in a
>library?
> ...
> import mylib
> logger.enable('mylib')
>
>expecting that it would report any log messages above level DEBUG, just
>as it does when I don't disable logging.

Have you configured the logging system?

Note that `logging.config.fileConfig` may do strange things
regarding disabling (due to its default parameter
`disable_existing_loggers=True`).
I had several cases of missing log entries because `fileConfig`
had disabled already existing loggers.
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Re: Using loguru in a library [ In reply to ]

specially at processed

May 2, 2023, 3:10 PM

Post #5 of 5 (181 views)

Permalink

Dieter Maurer wrote:

> Roy Hann wrote at 2023-4-30 15:40 -0000:
>>Is there anyone using loguru (loguru 0.5.3 in my case) successfully in a
>>library?
>> ...
>> import mylib
>> logger.enable('mylib')
>>
>>expecting that it would report any log messages above level DEBUG, just
>>as it does when I don't disable logging.
>
> Have you configured the logging system?
>
> Note that `logging.config.fileConfig` may do strange things
> regarding disabling (due to its default parameter
> `disable_existing_loggers=True`).
> I had several cases of missing log entries because `fileConfig`
> had disabled already existing loggers.

Thank you for the response Dieter.

I am using the loguru package, not the logging package.

I think my next step is going to have be creating a minimal test
case to post on stackoverflow. :-P

Roy
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