[Python-Dev] Symbolic errno values in error messages

[Alexander Belopolsky]

On Fri, May 16, 2008 at 10:15 AM, Nick Coghlan <ncoghlan at gmail.com> wrote:
> Alexander Belopolsky wrote:
..
>> Use standard C library char* strerror(int errnum) function.   You can see
>> an example usage in Modules/posixmodule.c (posix_strerror).
>
> I don't believe that would provide adequate Windows support.
>

Until recently, python had its own cross-platform implementation of
strerror, but it was removed because it was deemed redundant.  This
tells me that it should work on windows.   On the other hand, IOError
object and in fact EnvironmentError object already has strerror member
which is printed when available:

>>> try:
...    open('/')
... except Exception,e:
...    pass
...
>>> print e
[Errno 21] Is a directory

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