[issue23597] Allow easy display of local variables in log messages?

[Martin]

Martin  added the comment:

In this pull request[1] I introduced a `format_locals` which can be provided to 
customize the serialization of the local variables of each frame. This could be 
used to filter out variables with certain names, for example. In this context, 
you could use a certain naming convention for variables with sensitive 
information and filter them out:

def _format_locals(filename, lineno, name, locals):
return {k: repr(v) for k,v in locals.items() if not 
k.endsswith("_sensitive")}

traceback.TracebackException.from_exception(e, capture_locals=True, 
format_locals=format_locals).format()

(This should be exactly what Robert was suggesting.)


[1] https://github.com/python/cpython/pull/29299

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pull_request: https://github.com/python/cpython/pull/29299

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[issue23597] Allow easy display of local variables in log messages?

[Irit Katriel]

Irit Katriel  added the comment:

See also 43656.

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[issue23597] Allow easy display of local variables in log messages?

[Irit Katriel]

Change by Irit Katriel :


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type:  -> enhancement
versions: +Python 3.11 -Python 3.5

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[issue23597] Allow easy display of local variables in log messages?

[Chris Rebert]

Changes by Chris Rebert pyb...@rebertia.com:


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[issue23597] Allow easy display of local variables in log messages?

[Nick Coghlan]

New submission from Nick Coghlan:

Issue #22936 added support for easily displaying local variables in tracebacks 
to the unittest and traceback modules.

Would it be worth also making this capability readily available in the logging 
APIs that display traceback messages?

The main argument against it is that automatically logging local variables in 
tracebacks is a *really* good way to introduce sensitive information leaks into 
your log messages. Safe repr type objects (which automatically mask sensitive 
details in __repr__()) can mitigate this, but we don't provide such an object 
in the standard library (not even for bytes, bytearray or str, which are the 
typical containers for potentially sensitive data like passwords).

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title: Allow easy display of local variables in log messages?
versions: Python 3.5

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[issue23597] Allow easy display of local variables in log messages?

[Nick Coghlan]

Changes by Nick Coghlan ncogh...@gmail.com:


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dependencies: +traceback module has no way to show locals

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[issue23597] Allow easy display of local variables in log messages?

[Robert Collins]

Robert Collins added the comment:

Yes, for debugging etc this can be very useful. I suggest further extending the 
new traceback interface to allow a filtering/transform hook of some sort, to 
allow folk more granular control than just repr overloading.

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