[Import-SIG] PEP 451: Big update.

[Nick Coghlan]

On 20 Sep 2013 00:12, "Brett Cannon" <brett at python.org> wrote:
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>
>
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> On Thu, Sep 19, 2013 at 6:22 AM, Antoine Pitrou <solipsis at pitrou.net>
wrote:
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>>
>> Hi,
>>
>> I have some questions and comments:
>>
>> > origin - a string for the location from which the module is loaded,
>> > e.g. "builtin" for built-in modules and the filename for modules
>> > loaded from source.
>>
>> Filename or filepath? What if the module is stored in e.g. a ZIP file?
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> I think this would be what __file__ would be set to for zipfiles, so for
zip files it would be e.g. /some/file.zip/path/to/module.py
>
>>
>>
>> > submodule_search_locations - list of strings for where to find
>> > submodules, if a package (None otherwise).
>>
>> Why isn't is_package exposed as an attribute too?
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>
> It's redundant. The test for whether something is a package is literally
``submodule_search_locations is not None``. It just doesn't isn't
complicated enough to warrant another attribute. Plus being a package isn't
as important per-se as a concept as much as having a search path.
>
>>
>>
>> > cached (property) - a string for where the compiled module will be
>> > stored
>>
>> "where" is a filesystem location?
>> (absolute? relative to the origin?)
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> It's what http://docs.python.org/3/library/imp.html#imp.cache_from_source would
return.
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>>
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>> > has_location (RO-property) - the module's origin refers to a location.
>>
>> filesystem location? What about ZIP files?
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> It's a flag to basically say that origin contains what __file__ should be.

Thus indicating that get_data() on the loader can be used sensibly. Perhaps
we could just make setting __file__ conditional on the loader defining
get_data, rather than having it be a spec attribute?

I also suggest that we adopt the convention of using angle brackets in
non-location origins. So names like "<builtin>" and "<frozen>".

To respond to something Paul said, our completely opaque token is
"loader_state", origin is still intended to be a human readable string.

Cheers,
Nick.

>
> -Brett
>
>>
>>
>> > spec_from_file_location(name, location, *, loader=None,
>> > submodule_search_locations=None) - factory for file-based module specs
>>
>> What does it mean? Is it able to make "intelligent" decisions depending
>> on e.g. whether the module is an extension module or a pure Python
>> module?
>>
>> > from_loader(name, loader, *, origin=None, is_package=None) - factory
>> > based on information provided by loaders.
>>
>> That description is rather unhelpful.
>>
>> > importlib.find_spec(name, path=None) will return the spec for a module.
>>
>> Is the module supposed to be already loaded or not? How is the spec
>> "found"?
>>
>> Regards
>>
>> Antoine.
>>
>>
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