def get_options():
"""Return a list of acceptable QT APIs, in decreasing order of
preference
"""
#already imported Qt somewhere. Use that
loaded = loaded_api()
if loaded is not None:
return [loaded]
mpl = sys.modules.get('matplotlib', None)
if mpl is not None and not check_version(mpl.__version__, '1.0.2'):
#1.0.1 only supports PyQt4 v1
return [QT_API_PYQT_DEFAULT]
if os.environ.get('QT_API', None) is None:
#no ETS variable. Ask mpl, then use either
return matplotlib_options(mpl) or [QT_API_PYQT_DEFAULT, QT_API_PYSIDE]
#ETS variable present. Will fallback to external.qt
return None
api_opts = get_options()
if api_opts is not None:
QtCore, QtGui, QtSvg, QT_API = load_qt(api_opts)
else: # use ETS variable
from IPython.external.qt import QtCore, QtGui, QtSvg, QT_API
mpqt)
def get_options():
"""Return a list of acceptable QT APIs, in decreasing order of
preference
"""
#already imported Qt somewhere. Use that
loaded = loaded_api()
if loaded is not None:
return [loaded]
mpl = sys.modules.get('matplotlib', None)
if mpl is not None and not check_version(mpl.__version__, '1.0.2'):
#1.0.1 only supports PyQt4 v1
return [QT_API_PYQT_DEFAULT]
if os.environ.get('QT_API', None) is None:
#no ETS variable. Ask mpl, then use either
return matplotlib_options(mpl) or [QT_API_PYQT_DEFAULT, QT_API_PYSIDE]
#ETS variable present. Will fallback to external.qt
return None
api_opts = get_options()
if api_opts is not None:
QtCore, QtGui, QtSvg, QT_API = load_qt(api_opts)
else: # use ETS variable
from IPython.external.qt import QtCore, QtGui, QtSvg, QT_API
def test_prevent_multi_import_qtdefault(self):
from IPython.external.qt_loaders import load_qt
load_qt(['pyqtdefault'])
with pytest.raises(ImportError) as exc:
import PySide
assert exc.value.args[0].strip().startswith('Importing PySide')
def test_prevent_incompatible_qt_multimport(self):
from IPython.external.qt_loaders import load_qt
load_qt(['pyqt'])
with pytest.raises(ImportError) as exc:
load_qt(['pyqtv1'])
assert exc.value.args[0].strip().startswith('Could not load')
def test_prevent_multi_import_pyside(self):
from IPython.external.qt_loaders import load_qt
load_qt(['pyside'])
with pytest.raises(ImportError) as exc:
import PyQt4
assert exc.value.args[0].strip().startswith('Importing PyQt4 disabled')
