[OE-core] "inherit setuptools" versus "inherit pypi" -- a python style question

[Jack Mitchell]

On 03/03/17 10:06, Robert P. J. Day wrote:
> On Fri, 3 Mar 2017, Anders Darander wrote:
> 
>> * Robert P. J. Day <rpjday at crashcourse.ca> [170302 12:33]:
>>
>>> On Thu, 2 Mar 2017, Robert P. J. Day wrote:
>>
>>>>   inherit pypi setuptools
>>>>   require python-psutil.inc
>>
>>>> and the corresponding .inc file contains:
>>
>>>>   RDEPENDS_${PN} += " \
>>>>     ${PYTHON_PN}-shell \
>>>>     ${PYTHON_PN}-subprocess \
>>>>     ${PYTHON_PN}-threading \
>>>>   "
>>
>>>> so the first recipe inherits pypi, the second one inherits setuptools,
>>>> and the third inherits *both*. what is the *preferred* style?
>>
>> Well, different purposes... If you take a look at pypi.bbclass, it's all
>> about how to retrieve the module (source code). setuptools.bbclass is
>> about how to install the module...
>>
>> Ie retrieving and installing...
> 
>   yes, i finally twigged to that, but is there a *preferred* style?
> from what i've seen, if there is a pair of files for a python module:
> 
>   * foo.bb (which includes ...)
>   * foo.inc
> 
> the common style seems to be that:
> 
>   * foo.bb inherits setuptools, while
>   * foo.inc inherits pypi (if necessary, of course)
> 
> at least i think that was the common style. obviously, there are
> perfectly acceptable variations, i'd just like to know if there is a
> recommended style.
> 

One reason for this is for py2/py3 reciepes. python-foo.bb will inherit
setuptools, while python3-foo has to inherit setuptools3. So I would
imagine that setuptools should always go in the bb. While pypi is python
version agnostic I believe.

Cheers,