On Apr 15, 2010, at 08:33 AM, Nick Coghlan wrote: >Brett Cannon wrote: >> And just a quick suggestion: can we standardize what >> imp.source_to_path() and friend are supposed to return if the >> interpreter doesn't support bytecode? I will probably have to rely on >> that for something so it would be best to say now whether it should be >> None or raise an exception so there is no divergence on this between VMs. > >Returning None sounds like the most straightforward option. "__cached__ >= None" will just mean "for whatever reason, we have no cached filename >for this file". It may be the cached file doesn't exist, or the >interpreter simply wasn't in a position to figure it out in a user >visible way.
I completely agree. The PEP already leaves __cached__ up to the implementation, but I'll update it to be clear that None is an acceptable return value from imp.cached_from_source() (which is the one I think you mean), and also what __cached__=None means. Thanks Brett and Nick. -Barry
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