Update py-bx-python package (#15175)

* Update py-bx-python package

- add update to py-bx-python
- switch to pypi downloads
- set dependencies

* Update var/spack/repos/builtin/packages/py-bx-python/package.py

I had initially pulled version 0.8.6 and then updated that to 0.8.8 but missed the change in the python specs between those two versions.

Co-Authored-By: Adam J. Stewart <ajstewart426@gmail.com>

* Fix version 0.7.4

- set dependency on python2
- add dependency on py-python-lzo
- add py-python-lzo package
- set py-numpy dependency to correspond to latest version that works
  with python2

* Add constraint for py-six dependency

* Update var/spack/repos/builtin/packages/py-bx-python/package.py

Ah, I had that `when` clause in and then took it out as it did not seem to be needed. I guess it is always better to be more explicit.

Co-Authored-By: Adam J. Stewart <ajstewart426@gmail.com>

* Remove py-numpy constraint

Let the concretizer catch the conflict with python2 and py-numpy
versions.

Co-authored-by: Adam J. Stewart <ajstewart426@gmail.com>

var/spack/repos/builtin/packages/py-bx-python/package.py

@@ -11,10 +11,17 @@ class PyBxPython(PythonPackage):
     to allow for rapid implementation of genome scale analyses."""
 
     homepage = "https://github.com/bxlab/bx-python"
-    url      = "https://github.com/bxlab/bx-python/archive/v0.7.4.tar.gz"
+    url      = "https://pypi.io/packages/source/b/bx-python/bx-python-0.8.8.tar.gz"
 
-    version('0.7.4', sha256='1066d1e56d062d0661f23c19942eb757bd7ab7cb8bc7d89a72fdc3931c995cb4')
+    version('0.8.8', sha256='ad0808ab19c007e8beebadc31827e0d7560ac0e935f1100fb8cc93607400bb47')
+    version('0.7.4',
+            sha256='1066d1e56d062d0661f23c19942eb757bd7ab7cb8bc7d89a72fdc3931c995cb4',
+            url="https://github.com/bxlab/bx-python/archive/v0.7.4.tar.gz")
 
+    depends_on('python@2.4:2.7', type=('build', 'run'), when='@:0.7')
+    depends_on('python@2.7:2.8,3.5:', type=('build', 'run'), when='@0.8:')
     depends_on('py-setuptools', type='build')
-    depends_on('py-numpy',      type=('build', 'run'))
-    depends_on('py-six',        type=('build', 'run'))
+    depends_on('py-python-lzo', type=('build', 'run'), when='@:0.7')
+    depends_on('py-cython', type='build', when='@0.8:')
+    depends_on('py-numpy', type=('build', 'run'))
+    depends_on('py-six', type=('build', 'run'), when='@0.8:')

var/spack/repos/builtin/packages/py-python-lzo/package.py

@@ -0,0 +1,18 @@
+# Copyright 2013-2020 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 PyPythonLzo(PythonPackage):
+    """This module provides Python bindings for the LZO data compression
+    library."""
+
+    homepage = "https://github.com/jd-boyd/python-lzo"
+    url      = "https://pypi.io/packages/source/p/python-lzo/python-lzo-1.12.tar.gz"
+
+    version('1.12', sha256='97a8e46825e8f1abd84c2a3372bc09adae9745a5be5d3af2692cd850dac35345')
+
+    depends_on('lzo')