[Python-Dev] IO module precisions and exception hierarchy (original) (raw)
Michael Foord fuzzyman at voidspace.org.uk
Sun Sep 27 23:32:06 CEST 2009
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Nick Coghlan wrote:
Antoine Pitrou wrote:
This deserves its own PEP IMO, although I'm not sure it would be accepted (ISTR the idea of a detailed IO exception hierarchy was already refused in the past).
Not as such - a big exception hierarchy rewrite was rejected, but nothing specifically limited to the IO exceptions. Michael's response cut to the heart of the issue though - a richer IO exception hierarchy can make life interesting for compatibility purposes (especially when creating "file-like" interfaces to non-file objects).
Some of the error messages are truly awful though as things stand, especially for someone new to Python. Try to read from a file handle opened in read mode for example: IOError: [Errno 9] Bad file descriptor
Michael
Cheers, Nick.
-- http://www.ironpythoninaction.com/ http://www.voidspace.org.uk/blog
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