New submission from STINNER Victor:
Currently, the warnings.showformat() function take between 4 and 6 parameters
and it's not possible to add new parameters.
warnings.showformat() calls warnings.formatwarnings() with 5 parameters. Again,
it's not easy to pass new parameters.
I would like to add a new "source" parameter for ResourceWarning: see issue
#26567 "ResourceWarning: Use tracemalloc to display the traceback where an
object was allocated when a ResourceWarning is emitted".
To make warnings extensible, I propose to:
* Add new showmsg() and formatmsg() functions to the warnings module, these
functions take a warnings.WarningMessage instance
* The _warnings module calls warnings.showmsg() rather than
warnings.showwarning()
* For backward compatibility, warnings.showmsg() calls warnings.showwarning()
if warnings.showwarning() was replaced. Same for warnings.formatmsg(): call
warnings.formatwarning() if replaced.
Attached patch implements these changes.
With these changes, the warnings looks a little bit more like the logging
module and its logging.LogRecord class.
The patch is incomplete, it doesn't add much tests yet and it doesn't touch the
documentation. I would prefer to get the new API (and the whole idea) approved
before going too far.
Note: If warnings.showwarning is deleted ("del warnings.showwarning"),
showmsg() uses its own implementation. Same for formatmsg().
----------
files: warnings_showmsg.patch
keywords: patch
messages: 261814
nosy: haypo
priority: normal
severity: normal
status: open
title: Add a new warnings.showmsg() function taking a warnings.WarningMessage
object
versions: Python 3.6
Added file: http://bugs.python.org/file42172/warnings_showmsg.patch
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<http://bugs.python.org/issue26568>
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