Jesus Cea wrote:
Recently we added "-Wd" flags to buildbots. I was wondering about the
effect of it. documentation doesn't help.

I could study the code, but I guess other people can have the very same
question and I think the answer should be in the archives, somewhere.

I studied the code ;)

-Wd enables all warnings.  It adds 'd' to sys.warnoptions, which in turn adds a new first entry to _warnings.filters which matches all warnings and enables the "default" behavior, which is to show it once per execution of the Python interpreter.
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On Tue, Apr 6, 2010 at 04:19, Larry Hastings <larry@hastings.org> wrote:

Jesus Cea wrote:
Recently we added "-Wd" flags to buildbots. I was wondering about the
effect of it. documentation doesn't help.

I could study the code, but I guess other people can have the very same
question and I think the answer should be in the archives, somewhere.

I studied the code ;)

\-Wd enables all warnings. It adds 'd' to sys.warnoptions, which in turn adds a new first entry to \_warnings.filters which matches all warnings and enables the "default" behavior, which is to show it once per execution of the Python interpreter.

For example, if you run "python -Wd" on the current trunk (2.7) and execute the statement "import bsddb" you get a PendingDeprecationWarning exception. Without -Wd that warning would be suppressed.

Hope I didn't miss any important subtleties,


Nope, you got it right. A little bit of documentation is in 2.7: http://docs.python.org/dev/library/warnings.html#updating-code-for-new-versions-of-python .

//larry//

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