From 98b743bda7ad109829fee7b6eb9052fe2c32b712 Mon Sep 17 00:00:00 2001
From: John Kirkham <kirkhamj@janelia.hhmi.org>
Date: Sun, 19 Feb 2017 18:49:12 -0500
Subject: [PATCH 1/3] Try backports.lzma on Python 2.

---
 numcodecs/__init__.py        |  5 +++--
 numcodecs/lzma.py            | 10 ++++++++--
 numcodecs/tests/test_lzma.py | 12 +++++++++---
 3 files changed, 20 insertions(+), 7 deletions(-)

diff --git a/numcodecs/__init__.py b/numcodecs/__init__.py
index 973d6ea1..c85d239c 100644
--- a/numcodecs/__init__.py
+++ b/numcodecs/__init__.py
@@ -25,7 +25,6 @@
 
 from numcodecs.version import version as __version__
 from numcodecs.registry import get_codec, register_codec
-from numcodecs.compat import PY2
 
 from numcodecs.zlib import Zlib
 register_codec(Zlib)
@@ -33,9 +32,11 @@
 from numcodecs.bz2 import BZ2
 register_codec(BZ2)
 
-if not PY2:
+try:
     from numcodecs.lzma import LZMA
     register_codec(LZMA)
+except ImportError:  # pragma: no cover
+    pass
 
 try:
     from numcodecs import blosc as _blosc
diff --git a/numcodecs/lzma.py b/numcodecs/lzma.py
index e12ab2b8..33a5044e 100644
--- a/numcodecs/lzma.py
+++ b/numcodecs/lzma.py
@@ -2,11 +2,17 @@
 from __future__ import absolute_import, print_function, division
 
 
+_lzma = None
 try:
     import lzma as _lzma
 except ImportError:  # pragma: no cover
-    pass
-else:
+    try:
+        from backports import lzma as _lzma
+    except ImportError:
+        pass
+
+
+if _lzma:
 
     import numpy as np
     from numcodecs.abc import Codec
diff --git a/numcodecs/tests/test_lzma.py b/numcodecs/tests/test_lzma.py
index 23d0a3e6..1f42f7e7 100644
--- a/numcodecs/tests/test_lzma.py
+++ b/numcodecs/tests/test_lzma.py
@@ -2,12 +2,18 @@
 from __future__ import absolute_import, print_function, division
 
 
-from numcodecs.compat import PY2
+_lzma = None
+try:
+    import lzma as _lzma
+except ImportError:  # pragma: no cover
+    try:
+        from backports import lzma as _lzma
+    except ImportError:
+        pass
 
 
-if not PY2:
+if _lzma:
 
-    import lzma as _lzma
     import itertools
     import numpy as np
     from numcodecs.lzma import LZMA

From 086402ba673469ed722fd20e778f7af5588b5f5b Mon Sep 17 00:00:00 2001
From: John Kirkham <kirkhamj@janelia.hhmi.org>
Date: Tue, 21 Feb 2017 11:28:46 -0500
Subject: [PATCH 2/3] Test with backport.lzma with tox.

---
 tox.ini | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tox.ini b/tox.ini
index 31501edb..8cfa6f3c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,6 +10,7 @@ envlist = py27, py34, py35, docs
 setenv =
     PYTHONHASHSEED = 42
 commands =
+    py27: pip install -U backports.lzma
     python setup.py build_ext --inplace
     py27: nosetests -v numcodecs
     py34,py35: nosetests -v --with-coverage --cover-erase --cover-min-percentage=100 --cover-package=numcodecs --with-doctest --doctest-options=+NORMALIZE_WHITESPACE numcodecs

From 992943b23e3e77dbe01da81b264ecc5ea06ddd40 Mon Sep 17 00:00:00 2001
From: John Kirkham <kirkhamj@janelia.hhmi.org>
Date: Tue, 21 Feb 2017 11:43:57 -0500
Subject: [PATCH 3/3] Ensure `liblzma-dev` is available on Travis CI.

---
 .travis.yml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/.travis.yml b/.travis.yml
index 96a911e7..8641b1b4 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,12 @@
 language: python
 
+sudo: false
+
+addons:
+  apt:
+    packages:
+      - liblzma-dev
+
 python:
   - 2.7
   - 3.4