Problem when both PyQt4 and PyQt5 installed.

[Okko Willeboordse]

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

[Dennis Jensen]

These should be done in stand alone environments as this kind of thing happens with many languages when you have a non-backwards compatible release. Separate you installations either onto 2 different machines or use Virtual Environments to keep them separated.

Virus-free. www.avast.com

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