From 4b15fa75d5218171019ab1f48121cf5435fe5bc5 Mon Sep 17 00:00:00 2001
From: Eric Dill <edill@bnl.gov>
Date: Sun, 2 Aug 2015 16:46:41 -0400
Subject: [PATCH] TST: Use pgcollections.OrderedDict for 2.6 compat

---
 .travis.yml                             |  5 +++++
 examples/test_examples.py               | 15 ++++++++++-----
 pyqtgraph/parametertree/SystemSolver.py |  2 +-
 3 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 3171f78d..f167791c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -65,6 +65,11 @@ install:
     - pip install pytest-xdist # multi-thread py.test
     - pip install pytest-cov # add coverage stats
     
+    # required for example testing on python 2.6
+    - if [ "${PYTHON}" == "2.6" ]; then
+        pip install importlib
+      fi;
+    
     # Debugging helpers
     - uname -a
     - cat /etc/issue
diff --git a/examples/test_examples.py b/examples/test_examples.py
index 0f9929ca..6fcee492 100644
--- a/examples/test_examples.py
+++ b/examples/test_examples.py
@@ -1,15 +1,20 @@
 from __future__ import print_function, division, absolute_import
 from pyqtgraph import Qt
-from examples import utils
-import importlib
+from . import utils
 import itertools
 import pytest
 
+# apparently importlib does not exist in python 2.6...
+try:
+    import importlib
+except ImportError:
+    # we are on python 2.6
+    print("If you want to test the examples, please install importlib from "
+          "pypi\n\npip install importlib\n\n")
+    pass
+
 files = utils.buildFileList(utils.examples)
-
 frontends = {Qt.PYQT4: False, Qt.PYSIDE: False}
-# frontends = {Qt.PYQT4: False, Qt.PYQT5: False, Qt.PYSIDE: False}
-
 # sort out which of the front ends are available
 for frontend in frontends.keys():
     try:
diff --git a/pyqtgraph/parametertree/SystemSolver.py b/pyqtgraph/parametertree/SystemSolver.py
index 0a889dfa..24e35e9a 100644
--- a/pyqtgraph/parametertree/SystemSolver.py
+++ b/pyqtgraph/parametertree/SystemSolver.py
@@ -1,4 +1,4 @@
-from collections import OrderedDict
+from ..pgcollections import OrderedDict
 import numpy as np
 
 class SystemSolver(object):