Installing pyqt only in Python 2.7

Since pyqt is not available on PyPI, we can't install
it using pip, relying only on apt-get to install it
if we are in python 2.7.

PySide is available, but in order to reduce build time
we also install it using apt-get when in Python 2.7.

Author: nicoddemus

.travis.yml

@@ -1,30 +1,42 @@
 language: python
 python:
-  - "2.7"
-  - "3.4"
-before_script:
- - "export DISPLAY=:99.0"
- - "sh -e /etc/init.d/xvfb start"
- - sleep 3
+  - 2.7
+  - 3.4
 
 env:
  - PYTEST_VERSION=2.5.2 PYTEST_QT_FORCE_PYQT=true
  - PYTEST_VERSION=2.5.2 PYTEST_QT_FORCE_PYQT=false
 
+matrix:
+  exclude:
+    - python: 3.4
+      env: PYTEST_VERSION=2.5.2 PYTEST_QT_FORCE_PYQT=true
+
 install:
  # PySide
- - if [[ $PYTEST_QT_FORCE_PYQT == 'false' ]]; then
- - pip install pyside
+ - echo $TRAVIS_PYTHON_VERSION
+ - if [[ "$PYTEST_QT_FORCE_PYQT" == "false" && "$TRAVIS_PYTHON_VERSION" == "2.7" ]]; then
+ -     sudo apt-get install -qq python-pyside;
+ -     ln -s /usr/lib/python$TRAVIS_PYTHON_VERSION/dist-packages/PySide /home/travis/virtualenv/python$TRAVIS_PYTHON_VERSION/lib/python$TRAVIS_PYTHON_VERSION/site-packages -v;
+ - elif [[ "$PYTEST_QT_FORCE_PYQT" == "false" && "$TRAVIS_PYTHON_VERSION" != "2.7" ]]; then
+ -     pip install pyside;
  - fi
 
  # PyQt4
- - if [[ $PYTEST_QT_FORCE_PYQT == 'true' ]]; then
- - pip install pyqt4
+ - if [[ "$PYTEST_QT_FORCE_PYQT" == "true" ]]; then
+ -   sudo apt-get install -qq python-qt4
+ -   ln -s /usr/lib/python$TRAVIS_PYTHON_VERSION/dist-packages/PyQt4 /home/travis/virtualenv/python$TRAVIS_PYTHON_VERSION/lib/python$TRAVIS_PYTHON_VERSION/site-packages/PyQt4 -v
+ -   ln -s /usr/lib/python$TRAVIS_PYTHON_VERSION/dist-packages/sip* /home/travis/virtualenv/python$TRAVIS_PYTHON_VERSION/lib/python$TRAVIS_PYTHON_VERSION/site-packages -v
  - fi
 
  # PyTest
  - pip uninstall -y pytest
  - pip install pytest==$PYTEST_VERSION
-  
+
+before_script:
+ - export DISPLAY=:99.0
+ - sh -e /etc/init.d/xvfb start
+ - sleep 3
+
 script:
  - py.test