When both PyQt4 and PyQt5 are installed (in a transition phase) running
pyqtgraph code results in an error (see stacktrace below) when PyQt4 is to
be used by pyqtgraph.
This is because pyqtgraph uses PyQt5.sip instead of sip, see following code
from the Qt module;
# Common to PyQt4 and 5
if QT_LIB in [PYQT4, PYQT5]:
QtVersion = QtCore.QT_VERSION_STR
try:
from PyQt5 import sip
except ImportError:
import sip
If PyQt5 is present then PyQt5.sip is used even when PyQt4 is to be used.
Traceback (most recent call last):
File "C:\Program Files
(x86)\Python37-32\lib\site-packages\pyqtgraph\graphicsItems\GraphicsObject.py",
line 26, in itemChange
self.parentChanged()
File "C:\Program Files
(x86)\Python37-32\lib\site-packages\pyqtgraph\graphicsItems\GraphicsItem.py",
line 463, in parentChanged
self._updateView()
File "C:\Program Files
(x86)\Python37-32\lib\site-packages\pyqtgraph\graphicsItems\GraphicsItem.py",
line 480, in _updateView
view = self.getViewBox()
File "C:\Program Files
(x86)\Python37-32\lib\site-packages\pyqtgraph\graphicsItems\GraphicsItem.py",
line 88, in getViewBox
vb = self.getViewWidget()
File "C:\Program Files
(x86)\Python37-32\lib\site-packages\pyqtgraph\graphicsItems\GraphicsItem.py",
line 65, in getViewWidget
if v is not None and not isQObjectAlive(v):
File "C:\Program Files
(x86)\Python37-32\lib\site-packages\pyqtgraph\Qt.py", line 328, in
isQObjectAlive
return not sip.isdeleted(obj)
TypeError: isdeleted() argument 1 must be sip.simplewrapper, not PenPLotter
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