gnu: Add python-plotly.

* gnu/packages/graph.scm (python-plotly, python2-plotly): New variables.

gnu/packages/graph.scm

@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2017, 2018 Ricardo Wurmus <rekado@elephly.net>
+;;; Copyright © 2018 Joshua Sierles, Nextjournal <joshua@nextjournal.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -33,7 +34,10 @@
   #:use-module (gnu packages maths)
   #:use-module (gnu packages multiprecision)
   #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages python)
+  #:use-module (gnu packages python-web)
   #:use-module (gnu packages statistics)
+  #:use-module (gnu packages time)
   #:use-module (gnu packages xml))
 
 (define-public igraph
@@ -199,3 +203,34 @@ objects from the @code{graph} package.")
 represented by horizontal lines, and edges are represented by vertical
 lines.")
       (license license:expat))))
+
+(define-public python-plotly
+  (package
+    (name "python-plotly")
+    (version "2.4.0")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (pypi-uri "plotly" version))
+        (sha256
+         (base32
+          "0n18116jz6bl5n9cq23vabv1gcbh1x3yficdnfq55v0z4cwy0zlf"))))
+    (build-system python-build-system)
+    (arguments
+     '(#:tests? #f)) ; The tests are not distributed in the release
+    (propagated-inputs
+     `(("python-decorator" ,python-decorator)
+       ("python-nbformat" ,python-nbformat)
+       ("python-pytz" ,python-pytz)
+       ("python-requests" ,python-requests)
+       ("python-six" ,python-six)))
+    (home-page "https://plot.ly/python/")
+    (synopsis "Interactive plotting library for Python")
+    (description "Plotly's Python graphing library makes interactive,
+publication-quality graphs online.  Examples of how to make line plots, scatter
+plots, area charts, bar charts, error bars, box plots, histograms, heatmaps,
+subplots, multiple-axes, polar charts, and bubble charts. ")
+    (license license:expat)))
+
+(define-public python2-plotly
+  (package-with-python2 python-plotly))