[Python-Dev] Redirecting warnings.showwarning to logging (original) (raw)

Vinay Sajip vinay_sajip at yahoo.co.uk
Sun Nov 23 02:53:35 CET 2008

Sidnei da Silva <sidnei enfoldsystems.com> writes:

I do have one suggestion for improvement: instead of requiring the person to do this monkey patching, add a new 'log' action to the warnings filter as described by PEP 230 [1] (see: 'The Warnings Filter' section). This way, changing the behavior of how warnings are displayed (or not) is kept consistent and documented.

[1] http://www.python.org/dev/peps/pep-0230/

I see from PEP-230 the following under "Rejected Concerns" stated by GvR:

"Paul Prescod, Barry Warsaw and Fred Drake have brought up several additional concerns that I feel aren't critical. I address them here (the concerns are paraphrased, not exactly their words):"

[other concerns omitted]
- Barry: I'd like to add my own warning action.  Maybe if `action'
  could be a callable as well as a string.  Then in my IDE, I
  could set that to "mygui.popupWarningsDialog".

  Response: For that purpose you would override warnings.showwarning().
[other concerns omitted]

So, monkey-patching appears to be the suggested approach. Indeed, ISTM that the showwarning function is there specifically for the purpose of being monkey-patched out.

Regards,

Vinay Sajip

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