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""" Import Qt in a manner suitable for an IPython kernel.
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This is the import used for the `gui=qt` or `pylab=qt` initialization.
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Import Priority:
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if matplotlib has been imported and doesn't support v2 (<= 1.0.1):
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use PyQt4 @v1
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Next, ask ETS' QT_API env variable
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if QT_API not set:
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ask matplotlib via rcParams['backend.qt4']
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if it said PyQt:
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use PyQt4 @v1
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elif it said PySide:
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use PySide
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else: (matplotlib said nothing)
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# this is the default path - nobody told us anything
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try:
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PyQt @v1
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except:
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fallback on PySide
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else:
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use PyQt @v2 or PySide, depending on QT_API
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because ETS doesn't work with PyQt @v1.
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"""
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import os
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import sys
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from IPython.utils.warn import warn
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matplotlib = sys.modules.get('matplotlib')
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if matplotlib and matplotlib.__version__ <= '1.0.1':
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# 1.0.1 doesn't support pyside or v2, so stick with PyQt @v1,
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# and ignore everything else
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from PyQt4 import QtCore, QtGui
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else:
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# ask QT_API ETS variable *first*
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QT_API = os.environ.get('QT_API', None)
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if QT_API is None:
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# QT_API not set, ask matplotlib if it was imported (e.g. `pylab=qt`)
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if matplotlib:
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mpqt = matplotlib.rcParams.get('backend.qt4', None)
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else:
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mpqt = None
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if mpqt is None:
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# matplotlib not imported or had nothing to say.
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try:
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# default to unconfigured PyQt4
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from PyQt4 import QtCore, QtGui
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except ImportError:
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# fallback on PySide
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try:
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from PySide import QtCore, QtGui
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except ImportError:
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raise ImportError('Cannot import PySide or PyQt4')
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elif mpqt.lower() == 'pyqt4':
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# import PyQt4 unconfigured
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from PyQt4 import QtCore, QtGui
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elif mpqt.lower() == 'pyside':
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from PySide import QtCore, QtGui
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else:
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raise ImportError("unhandled value for backend.qt4 from matplotlib: %r"%mpqt)
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else:
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# QT_API specified, use PySide or PyQt+v2 API from external.qt
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# this means ETS is likely to be used, which requires v2
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try:
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from IPython.external.qt import QtCore, QtGui
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except ValueError as e:
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if 'API' in str(e):
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# PyQt4 already imported, and APIv2 couldn't be set
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# Give more meaningful message, and warn instead of raising
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warn("""
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Assigning the ETS variable `QT_API=pyqt` implies PyQt's v2 API for
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QString and QVariant, but PyQt has already been imported
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with v1 APIs. You should unset QT_API to work with PyQt4
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in its default mode.
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""")
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# allow it to still work
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from PyQt4 import QtCore, QtGui
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else:
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raise
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