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""" Import Qt in a manner suitable for an IPython kernel.

This is the import used for the `gui=qt` or `pylab=qt` initialization.

Import Priority:

if matplotlib has been imported and doesn't support v2 (<= 1.0.1):

use PyQt4 @v1

Next, ask ETS' QT_API env variable

if QT_API not set:

ask matplotlib via rcParams['backend.qt4']

if it said PyQt:

use PyQt4 @v1

elif it said PySide:

use PySide

else: (matplotlib said nothing)

# this is the default path - nobody told us anything

try:

PyQt @v1

except:

fallback on PySide

else:

use PyQt @v2 or PySide, depending on QT_API

because ETS doesn't work with PyQt @v1.

"""

import os

import sys

from IPython.utils.warn import warn

matplotlib = sys.modules.get('matplotlib')

if matplotlib and matplotlib.__version__ <= '1.0.1':

# 1.0.1 doesn't support pyside or v2, so stick with PyQt @v1,

# and ignore everything else

from PyQt4 import QtCore, QtGui

else:

# ask QT_API ETS variable *first*

QT_API = os.environ.get('QT_API', None)

if QT_API is None:

# QT_API not set, ask matplotlib if it was imported (e.g. `pylab=qt`)

if matplotlib:

mpqt = matplotlib.rcParams.get('backend.qt4', None)

else:

mpqt = None

if mpqt is None:

# matplotlib not imported or had nothing to say.

try:

# default to unconfigured PyQt4

from PyQt4 import QtCore, QtGui

except ImportError:

# fallback on PySide

try:

from PySide import QtCore, QtGui

except ImportError:

raise ImportError('Cannot import PySide or PyQt4')

elif mpqt.lower() == 'pyqt4':

# import PyQt4 unconfigured

from PyQt4 import QtCore, QtGui

elif mpqt.lower() == 'pyside':

from PySide import QtCore, QtGui

else:

raise ImportError("unhandled value for backend.qt4 from matplotlib: %r"%mpqt)

else:

# QT_API specified, use PySide or PyQt+v2 API from external.qt

# this means ETS is likely to be used, which requires v2

try:

from IPython.external.qt import QtCore, QtGui

except ValueError as e:

if 'API' in str(e):

# PyQt4 already imported, and APIv2 couldn't be set

# Give more meaningful message, and warn instead of raising

warn("""

Assigning the ETS variable `QT_API=pyqt` implies PyQt's v2 API for

QString and QVariant, but PyQt has already been imported

with v1 APIs. You should unset QT_API to work with PyQt4

in its default mode.

""")

# allow it to still work

from PyQt4 import QtCore, QtGui

else:

raise