[Python-Dev] Symbolic errno values in error messages (original) (raw)

Georg Brandl g.brandl at gmx.net
Mon May 19 22:04:41 CEST 2008

Yannick Gingras schrieb:

"Alexandre Vassalotti" <alexandre at peadrop.com> writes:

So now I am not sure what OP is proposing. Do you want to replace 21 with EISDIR in the above?

Yes, that's what I had in mind.

Then, check out EnvironmentErrorstr in Objects/exceptions.c. You should be able import the errno module and fetch its errorcode dictionary. It wasn't as hard as I expected. It's the first time that I play with the Python C API; I didn't expect the API to be that high level. I attached a patch to convert errno to its symbolic value when an EnvironmentError is printed. Should attach it to a ticket on bugs.python.org? I'm sure there is a style guide like PEP-8 for C code, feel free to point me to it because my patch is probably not fully style compliant. With Emacs, doing M-x c-set-style python doesn't seems to do the right thing. Are you all using a bunch of shared settings in you .emacs files?

For new-style Python C files, this style definition works well:

(c-add-style "python-new" '((indent-tabs-mode . nil) (fill-column . 78) (c-basic-offset . 4) (c-offsets-alist . ((substatement-open . 0) (inextern-lang . 0) (arglist-intro . +) (knr-argdecl-intro . +))) (c-hanging-braces-alist . ((brace-list-open) (brace-list-intro) (brace-list-close) (brace-entry-open) (substatement-open after) (block-close . c-snug-do-while))) (c-block-comment-prefix . "* ")) )

This is a very crude hook that auto-selects the C style depending on whether it finds a line starting with tab in the first 3000 characters in the file:

(defun c-select-style () (save-excursion (if (re-search-forward "^\t" 3000 t) (c-set-style "python") (c-set-style "python-new")))) (add-hook 'c-mode-hook 'c-select-style)

HTH, Georg

More information about the Python-Dev mailing list