* doc/guix.texi (Python Modules): New sub-subsection "Specifying
Dependencies".
---
doc/guix.texi | 37 +++++++++++++++++++++++++++++++++++++
1 file changed, 37 insertions(+)
diff --git a/doc/guix.texi b/doc/guix.texi
index 9bd8b43..f51ab75 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -12194,6 +12194,43 @@ 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
+
+@itemize
+
+@item
+All Python package required at run-time need to go into
+@code{propagated-inputs}. These are typically defined in
+@code{install_requires} or in a requirements-file.
+
+@item
+Python packages required only for building (to be found e.g. in
+@code{setup_requires}) or testing (to be found e.g. in
+@code{tests_require}) go into @code{native-inputs}. Examples are
+@emph{setuptools}, @emph{pytest}, @emph{mock}, and @emph{nose}. Of
+course if any of these packages is required at run-time, it needs to be
+set in @code{propagated-inputs}.
+
+@item
+@code{inputs} only contain programs or C-libraries (and such) required
+for building Python packages containing c-extensions (or such).
+
+@item
+If a Python package has optional extra dependencies
+(@code{extras_require}), not these are not listed here at all - except
+if there is a test-case in which case they are added to
+@code{native-inputs}.
+
+@item
+If a packages has complicated optional extra dependencies you may want
+to define another package to ease resolving these dependencies for the
+user. E.g. @code{python-abcdef-ssh} inherits @code{python-abcdef} and
+adds the dependencies required for the @emph{ssh} extra feature.
+
+@end itemize
+
+
@node Perl Modules
@subsection Perl Modules
--
2.7.4
