[Python-Dev] Issue 6081: format string using mapping rather than kwargs (original) (raw)

Filip GruszczyƄski gruszczy at gmail.com
Thu Mar 25 00🔞21 CET 2010

Hello everyone,

I was told to bring this issue to python-dev, but I was reluctant to do this until I was confident I can solve the problem. I have managed to provide the patch that works, so now I can talk about how this should be done, just as Eric told me. Here is the link to the ticket: http://bugs.python.org/issue6081.

In the issue Raymond Hettinger proposed adding method to string, that would allow to explicitly pass subscriptable object, from which formatting of a string would be done. Two questions arise:

  1. whether add such functionality at all?
  2. how the method should be called? Should formatting options based on *args be kept (like using {0} in formatted string) or not and how argument should be passed. Eric suggested passing only mapping and only adding *args, if that is found useful by users; I have though about having both mapping and *args, which would keep it similar to the old formatting. Another option is to have *args and one keyword with the mapping (instead of kwargs).

I would appreciate any advice on this topic, even if this ticket would be dismissed altogether, as I would like to learn as much as possible on practices on developing Python.

-- Filip GruszczyƄski

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