[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.
Raymond
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