On Mon, Sep 7, 2020, 7:38 AM vince touache <[email protected]> wrote:
> hi all,
>
> I'm finally trying to work clean with the logging lib, but there are still
> a few things I can't figure out, even after reading previous topics here
> and elsewhere.
>
> Everything about Handlers and Formatters kinda make sense, I'm not too
> concerned about it. Instead, what bugs me is more the parent/child
> relationship with the root.
> *(for all my experiments, I'm using pymel's tool to vizualise my logging
> hierarchy)*
>
> *What do I want to achieve:*
> I' like to create one main logger, under the root, when initializing my
> program, and then mimic my project hierarchy in the logger, so that I have
> full control on the entire verbosity.
> So if my program looks like this:
> my_app
> |__ child01.py
> |__ child02.py
>
> I'd like to have something like this in my loggers:
> root (created by Maya)
> |__ my_app
> |__ my_app.child01
> |__ my_app.child02
>
> However, when trying to do this, there are many things that don't make
> sense to me:
>
> 1. If I look at PyMel, they are using the "children" property, and when I
> use it in maya, it sometimes works, sometimes not. I can't understand the
> logic. Looks like the children attribute is created only when there are
> children, which sounds like a weird design to me. Am I missing something?
> Furthermore, even though I can use logging.root.children in maya, this
> simply does not seem to exist outside of maya (python2 or python3), even
> though the logging.__version__ is the same
> ex:
> mainLog = logging.getLogger("my_tool") # meant to be the parent for my
> entire app
> child1 = logging.getLogger("my_tool.child1") # similar to
> mainLog.getChild("child1"), correct?
> child1.parent.name
> >>> my_tool
> hasattr(mainLog, "children")
> >>> False
> wtf???? child1's parent is mainLog, but mainLog doesn't have a child?
>
> 2. How is it possible that I have twice the same logger, at the same
> level? If I run several time my tool, I end up with root.my_logger being
> here twice or more. I thought the whole point of the logging was to behave
> like a singleton, and logging.getLogger("my_app") would return me the
> existing logger instance for my_app, if exists, create it otherwise.
> Instead, I end up with 2 loggers named the same, and apparently at the same
> level of hierarchy:
> for x in logging.root.children:
> print x.name
> >>> will return me several time the same name. If I want to do it on
> purpose, I can't
>
> 3. Is there, somewhere, I page I can look at, with a clean logging system?
>
>
> I didn't detail too much all the examples or put screenshots because this
> email is long enough already, but I can provide totally more info if needed
> ofc =]
>
> If anyone has an explanation for me, that' would be reeeeally appreciated!
>
> Thank you so much !
>
I'm not fully clear on why this has gotten so complex in your application,
but usually I would expect for the main to establish the highest level
logger and all the library modules to create their own logger and use just
their own logger instance. Then the top level logger can set up the
handlers and formatters, while the child loggers don't have to be aware of
that concept and their log messages just bubble up to handlers.
When naming the loggers it would also be common to use __name__ to
automatically establish the child relationship from their import paths. But
I am not sure how you are intending to use getChild in your logic? Does
your main need to be able to directly access these child loggers for some
reason?
As for why you are seeing multiple copies of loggers, that is not supposed
to happen. Are you using the reload() function somewhere which can lead to
duplicate execution of code in a shared Maya Python interpreter? Is it a
problem thag you are appending handlers more than once to the same loggers?
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