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doc: Add guide on how to specify dependencies for Python packages.

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* doc/guix.texi (Python Modules): New sub-subsection "Specifying
Dependencies".

Co-authored-by: Ludovic Courtès <ludo@gnu.org>
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Hartmut Goebel 2016-10-10 18:15:23 +02:00 • committed by Ludovic Courtès
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@ -12345,6 +12345,54 @@ starts with @code{py} (e.g. @code{pytz}), we keep it and prefix it as
described above.
@subsubsection Specifying Dependencies
@cindex inputs, for Python packages
Dependency information for Python packages is usually available in the
package source tree, with varying degrees of accuracy: in the
@file{setup.py} file, in @file{requirements.txt}, or in @file{tox.ini}.
Your mission, when writing a recipe for a Python package, is to map
these dependencies to the appropriate type of ``input'' (@pxref{package
Reference, inputs}). Although the @code{pypi} importer normally does a
good job (@pxref{Invoking guix import}), you may want to check the
following check list to determine which dependency goes where.
@itemize
@item
Python dependencies required at run time go into
@code{propagated-inputs}. They are typically defined with the
@code{install_requires} keyword in @file{setup.py}, or in the
@file{requirements.txt} file.
@item
Python packages required only at build time---e.g., those listed with
the @code{setup_requires} keyword in @file{setup.py}---or only for
testing---e.g., those in @code{tests_require}---go into
@code{native-inputs}. The rationale is that (1) they do not need to be
propagated because they are not needed at run time, and (2) in a
cross-compilation context, it's the ``native'' input that we'd want.
Examples are @code{setuptools}, which is usually needed only at build
time, or the @code{pytest}, @code{mock}, and @code{nose} test
frameworks. Of course if any of these packages is also required at
run-time, it needs to go to @code{propagated-inputs}.
@item
Anything that does not fall in the previous categories goes to
@code{inputs}, for example programs or C libraries required for building
Python packages containing C extensions.
@item
If a Python package has optional dependencies (@code{extras_require}),
it is up to you to decide whether to add them or not, based on their
usefulness/overhead ratio (@pxref{Submitting Patches, @command{guix
size}}).
@end itemize
@node Perl Modules
@subsection Perl Modules