py-rnacocktail: a new package. (#13761)

* py-rnacocktail: a new package.

* flake8.

* Add build-time dependencies.

var/spack/repos/builtin/packages/py-rnacocktail/package.py

@@ -0,0 +1,25 @@
+# Copyright 2013-2019 Lawrence Livermore National Security, LLC and other
+# Spack Project Developers. See the top-level COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack import *
+
+
+class PyRnacocktail(PythonPackage):
+    """RNACocktail: A comprehensive framework
+    for accurate and efficient RNA-Seq analysis."""
+
+    homepage = "http://bioinform.github.io/rnacocktail/"
+    url      = "https://github.com/bioinform/rnacocktail/archive/v0.2.2.tar.gz"
+
+    version('0.2.2', sha256='34aa0d1d7bd9d80303fe7dac5acc0519f7c1ed986397692588343d82ce45c7a5')
+
+    depends_on('python@2.7:2.8', type=('build', 'run'))
+    depends_on('py-setuptools', type='build')
+    depends_on('py-pybedtools', type=('build', 'run'))
+    depends_on('py-pysam', type=('build', 'run'))
+    # Higher version of py-pandas and py-numpy
+    # depends on python@3: which conflicts with py-rnacocktail
+    depends_on('py-pandas@:0.24.2', type=('build', 'run'))
+    depends_on('py-numpy@:1.16.5', type=('build', 'run'))