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01/04: gnu: Add python-backcall.

From: guix-commits
Subject: 01/04: gnu: Add python-backcall.
Date: Tue, 18 Jun 2019 08:22:38 -0400 (EDT)

rekado pushed a commit to branch master
in repository guix.

commit dede052a2cb5f8e35ddb342c6d77b5784f46ed0b
Author: Ricardo Wurmus <address@hidden>
Date:   Tue Jun 18 14:13:48 2019 +0200

    gnu: Add python-backcall.
    * gnu/packages/python-xyz.scm (python-backcall): New variable.
 gnu/packages/python-xyz.scm | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index 3efd18a..28ed440 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -5062,6 +5062,28 @@ installing @code{kernelspec}s for use with Jupyter 
     (description "The package provides a PARI/GP kernel for Jupyter.")
     (license license:gpl3+)))
+(define-public python-backcall
+  (package
+    (name "python-backcall")
+    (version "0.1.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "backcall" version))
+       (sha256
+        (base32
+         "1r01dqch3f8fdj3n6fviw8hxqrs6w5v0qw4izmvqzry1w9dxiv1q"))))
+    (build-system python-build-system)
+    (home-page "";)
+    (synopsis "Specifications for callback functions passed in to an API")
+    (description
+     "If your code lets other people supply callback functions, it's important
+to specify the function signature you expect, and check that functions support
+that.  Adding extra parameters later would break other peoples code unless
+you're careful.  The @code{backcall} package provides a way of specifying the
+callback signature using a prototype function.")
+    (license license:bsd-3)))
 ;; This is the latest release of the LTS version of ipython with support for
 ;; Python 2.7 and Python 3.x.  Later non-LTS versions starting from 6.0 have
 ;; dropped support for Python 2.7.  We may want to rename this package.

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