On Fri, Feb 20, 2009 at 12:33, Raymond Hettinger <pyt...@rcn.com> wrote:
> [Brett] > >> With io getting rewritten as an extension module, I think it's time to try >> to come up with a good best practice scenario for how to be able to control >> when a module uses a pure Python implementation and when it uses extension >> module optimizations. This is really only important for testing as if the >> extension is missing then the pure Python version is just flat-out used. >> > > There is also need in some modules where the two are not exactly equivalent > or where there are multiple C extensions to choose from. In PyYAML, there > needs to be an easier way to switch parsers and emitters (i.e. LibYAML). > There are similar issues with xmlrpclib with the choice of parsers, > marshallers, > and unmarshallers. Possibly, the same mechanism can offer the user more > control over which dbm is used when there are several choices. So are you saying you want something that takes multiple arguments like ``use_extension(py_name, *ext_names)``? Or are you wanting to go down the road of modules needing to define their own functions to use or unwind changes? -Brett
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