def prepare_pyqt4():
""" Set PySide compatible APIs. """
# This is not needed for Python 3 and can be removed when we no longer
# support Python 2.
try:
# required for PyQt >= 4.12.2
from PyQt4 import sip
except ImportError:
import sip
try:
sip.setapi('QDate', 2)
sip.setapi('QDateTime', 2)
sip.setapi('QString', 2)
sip.setapi('QTextStream', 2)
sip.setapi('QTime', 2)
sip.setapi('QUrl', 2)
sip.setapi('QVariant', 2)
except ValueError as exc:
# most likely caused by something else setting the API version
# before us: try to give a better error message to direct the user
# how to fix.
msg = exc.args[0]
msg += (". Pyface expects PyQt API 2 under Python 2. "
"Either import Pyface before any other Qt-using packages, "
"or explicitly set the API before importing any other "
"Qt-using packages.")
raise ValueError(msg)
if not PYQT_NAME:
try:
from PySide2 import QtGui, QtCore, QtOpenGL, QtWidgets
PYQT_NAME = 'PySide2'
except ImportError:
if DEBUG:
print('import PySide2 failed')
if not PYQT_NAME:
try:
try:
import PyQt4.sip as sip
except ImportError:
import sip
sip.setapi("QString", 2)
from PyQt4 import QtGui, QtCore, QtOpenGL
PYQT_NAME = 'PyQt4'
except ImportError:
if DEBUG:
print('import PyQt4 failed')
if not PYQT_NAME:
try:
from PySide import QtGui, QtCore, QtOpenGL
PYQT_NAME = 'PySide'
except ImportError:
if DEBUG:
print('import PySide failed')
if not PYQT_NAME: