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Try importing PySide, if we can't find sip. #2142

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Merged
merged 2 commits into from
Jul 6, 2013
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Try importing PySide, if we can't find sip. #2142

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5ce866c
Try importing PySide, if we can't find sip.
punchagan Jul 6, 2013
f85e322
[DOC] Add documentation for the QT_API environment variable.
punchagan Jul 3, 2013
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13 changes: 13 additions & 0 deletions doc/faq/usage_faq.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -284,7 +284,20 @@ macosx Cocoa rendering in OSX windows
.. _TkInter: http://wiki.python.org/moin/TkInter
.. _PyQt4: http://www.riverbankcomputing.co.uk/software/pyqt/intro

How do I select PyQt4 or PySide?
========================================

You can choose either PyQt4 or PySide when using the `qt4` backend by setting
the appropriate value for `backend.qt4` in your :file:`matplotlibrc` file. The
default value is `PyQt4`.

The setting in your :file:`matplotlibrc` file can be overridden by setting the
`QT_API` environment variable to either `pyqt` or `pyside` to use `PyQt4` or
`PySide`, respectively.

Since the default value for the bindings to be used is `PyQt4`,
:mod:`matplotlib` first tries to import it, if the import fails, it tries to
import `PySide`.

.. _interactive-mode:

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14 changes: 12 additions & 2 deletions lib/matplotlib/backends/qt4_compat.py
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Expand Up @@ -31,9 +31,19 @@
# of file dialog.
_getSaveFileName = None

# Flag to check if sip could be imported
_sip_imported = False

# Now perform the imports.
if QT_API in (QT_API_PYQT, QT_API_PYQTv2):
import sip
try:
import sip
_sip_imported = True
except ImportError:
# Try using PySide
QT_API = QT_API_PYSIDE

if _sip_imported:
if QT_API == QT_API_PYQTv2:
if QT_API_ENV == 'pyqt':
cond = ("Found 'QT_API=pyqt' environment variable. "
Expand Down Expand Up @@ -76,7 +86,7 @@
# call to getapi() can fail in older versions of sip
_getSaveFileName = QtGui.QFileDialog.getSaveFileName

else: # can only be pyside
else: # try importing pyside
from PySide import QtCore, QtGui, __version__, __version_info__
if __version_info__ < (1, 0, 3):
raise ImportError(
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