Martin von Loewis wrote:
>
> > > What user code exactly would break? Would that be a serious problem?
> >
> > All code which assumes a tuple as return value. It's hard to
> > say how much code makes such an assumption. Most Python
> > code probably only uses the sequence interface, but the C interface
> > was deliberately designed to return tuples so that C programmers
> > can easily access the data.
>
> I believe that code would continue to work if you got a instance of a
> tuple subtype.
It might work at Python level, maybe even at C level, but I really
don't see the point in trying to hack up a new type just for this
purpose.
Here's an implementation which pretty much solves the "problem":
--
### Helpers for codec lookup
def getencoder(encoding):
""" Lookup up the codec for the given encoding and return
its encoder function.
Raises a LookupError in case the encoding cannot be found.
"""
return lookup(encoding)[0]
def getdecoder(encoding):
""" Lookup up the codec for the given encoding and return
its decoder function.
Raises a LookupError in case the encoding cannot be found.
"""
return lookup(encoding)[1]
def getreader(encoding):
""" Lookup up the codec for the given encoding and return
its StreamReader class or factory function.
Raises a LookupError in case the encoding cannot be found.
"""
return lookup(encoding)[2]
def getwriter(encoding):
""" Lookup up the codec for the given encoding and return
its StreamWriter class or factory function.
Raises a LookupError in case the encoding cannot be found.
"""
return lookup(encoding)[3]
--
If noone objects, I'll check these into CVS along with some docs
for libcodecs.tex.
--
Marc-Andre Lemburg
CEO eGenix.com Software GmbH
______________________________________________________________________
Consulting & Company: http://www.egenix.com/
Python Software: http://www.lemburg.com/python/
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