Replace main stanza with PyQt6 compatable variant (#1645)

* Replace main stanza with PyQt6 compatable variant

* Use fn.mkQApp instead

* remove needless comments

examples/Arrow.py

@@ -50,8 +50,5 @@ p2.addItem(a)
 anim = a.makeAnimation(loop=-1)
 anim.start()
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/BarGraphItem.py

@@ -34,8 +34,5 @@ class BarGraph(pg.BarGraphItem):
 bg = BarGraph(x=x, y=y1*0.3+2, height=0.4+y1*0.2, width=0.8)
 win.addItem(bg)
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/CLIexample.py

@@ -18,9 +18,5 @@ pg.plot(data, title="Simplest possible plotting example")
 data = np.random.normal(size=(500,500))
 pg.image(data, title="Simplest possible image example")
 
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if sys.flags.interactive != 1 or not hasattr(QtCore, 'PYQT_VERSION'):
-        pg.QtGui.QApplication.exec_()
+    pg.mkQApp().exec_()

examples/ColorButton.py

@@ -26,8 +26,5 @@ def done(btn):
 btn.sigColorChanging.connect(change)
 btn.sigColorChanged.connect(done)
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/ConsoleWidget.py

@@ -29,8 +29,5 @@ c = pyqtgraph.console.ConsoleWidget(namespace=namespace, text=text)
 c.show()
 c.setWindowTitle('pyqtgraph example: ConsoleWidget')
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/CustomGraphItem.py

@@ -129,8 +129,5 @@ g.setData(pos=pos, adj=adj, pen=lines, size=1, symbol=symbols, pxMode=False, tex
 
 
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/DataSlicing.py

@@ -57,8 +57,5 @@ imv1.setLevels(-0.003, 0.003)
 
 update()
 
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/DataTreeWidget.py

@@ -42,8 +42,5 @@ tree.setWindowTitle('pyqtgraph example: DataTreeWidget')
 tree.resize(600,600)
 
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/DateAxisItem.py

@@ -26,8 +26,5 @@ w.plot(now-(2*np.pi/x)**2*100*np.pi*1e7, np.sin(x), symbol='o')
 w.setWindowTitle('pyqtgraph example: DateAxisItem')
 w.show()
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        app.exec_()
+    app.exec_()

examples/DateAxisItem_QtDesigner.py

@@ -42,8 +42,5 @@ window = ExampleApp()
 window.setWindowTitle('pyqtgraph example: DateAxisItem_QtDesigner')
 window.show()
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        app.exec_()
+    app.exec_()

examples/DiffTreeWidget.py

@@ -45,8 +45,5 @@ tree.setWindowTitle('pyqtgraph example: DiffTreeWidget')
 tree.resize(1000, 800)
 
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/Draw.py

@@ -42,8 +42,5 @@ kern = np.array([
 img.setDrawKernel(kern, mask=kern, center=(1,1), mode='add')
 img.setLevels([0, 10])
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/ErrorBarItem.py

@@ -26,8 +26,5 @@ err = pg.ErrorBarItem(x=x, y=y, top=top, bottom=bottom, beam=0.5)
 plt.addItem(err)
 plt.plot(x, y, symbol='o', pen={'color': 0.8, 'width': 2})
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/ExampleApp.py

@@ -393,7 +393,6 @@ def main():
     app = pg.mkQApp()
     loader = ExampleLoader()
     app.exec_()
-# or condition so pytest runs ExampleApp as part of test suite
+
 if __name__ == '__main__':
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        main()
+    main()

examples/FillBetweenItem.py

@@ -45,8 +45,5 @@ timer.timeout.connect(update)
 timer.start(30)
 
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/Flowchart.py

@@ -75,10 +75,5 @@ fc.connectTerminals(fc['dataIn'], pw1Node['In'])
 fc.connectTerminals(fNode['Out'], pw2Node['In'])
 fc.connectTerminals(fNode['Out'], fc['dataOut'])
 
-
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/FlowchartCustomNode.py

@@ -150,10 +150,5 @@ fc.connectTerminals(fc['dataIn'], v1Node['data'])
 fc.connectTerminals(fNode['dataOut'], v2Node['data'])
 fc.connectTerminals(fNode['dataOut'], fc['dataOut'])
 
-
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/GLBarGraphItem.py

@@ -39,9 +39,5 @@ size[...,2] = np.random.normal(size=(10,10))
 bg = gl.GLBarGraphItem(pos, size)
 w.addItem(bg)
 
-
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/GLImageItem.py

@@ -50,8 +50,5 @@ w.addItem(v3)
 ax = gl.GLAxisItem()
 w.addItem(ax)
 
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/GLIsosurface.py

@@ -66,10 +66,5 @@ m2.setGLOptions('additive')
 w.addItem(m2)
 m2.translate(-25, -25, -50)
     
-
-
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/GLLinePlotItem.py

@@ -43,10 +43,5 @@ for i in range(n):
     plt = gl.GLLinePlotItem(pos=pts, color=pg.glColor((i,n*1.3)), width=(i+1)/10., antialias=True)
     w.addItem(plt)
     
-
-
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/GLMeshItem.py

@@ -117,13 +117,5 @@ m6.rotate(0., 0, 1, 1)
 w.addItem(m5)
 w.addItem(m6)
 
-
-
-    
-
-
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/GLScatterPlotItem.py

@@ -106,9 +106,5 @@ t = QtCore.QTimer()
 t.timeout.connect(update)
 t.start(50)
 
-
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/GLSurfacePlot.py

@@ -92,8 +92,5 @@ timer = QtCore.QTimer()
 timer.timeout.connect(update)
 timer.start(30)
 
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/GLViewWidget.py

@@ -27,8 +27,5 @@ ax2.setParentItem(b)
 
 b.translate(1,1,1)
 
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/GLVolumeItem.py

@@ -63,8 +63,5 @@ w.addItem(v)
 ax = gl.GLAxisItem()
 w.addItem(ax)
 
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/GLshaders.py

@@ -101,10 +101,5 @@ w.addItem(m6)
 #w.addItem(m2)
 #m2.translate(-25, -25, -50)
     
-
-
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/GradientEditor.py

@@ -20,9 +20,5 @@ mw.show()
 ge = pg.GradientEditorItem()
 mw.setCentralItem(ge)
 
-
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/GradientWidget.py

@@ -47,12 +47,8 @@ l.addWidget(w3, 2, 1)
 l.addWidget(w4, 1, 0)
 l.addWidget(label, 1, 1)
 
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()
 
 
 

examples/GraphItem.py

@@ -57,11 +57,5 @@ lines = np.array([
 ## Update the graph
 g.setData(pos=pos, adj=adj, pen=lines, size=1, symbol=symbols, pxMode=False)
 
-
-
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/GraphicsLayout.py

@@ -78,10 +78,5 @@ p2.plot([1,3,2,4,3,5])
 p4.plot([1,3,2,4,3,5])
 p5.plot([1,3,2,4,3,5])
 
-
-
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/GraphicsScene.py

@@ -58,9 +58,5 @@ vb.addItem(prox)
 g = pg.GridItem()
 vb.addItem(g)
 
-
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/HistogramLUT.py

@@ -54,9 +54,5 @@ vb.autoRange()
 
 w.setImageItem(img)
 
-
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/ImageItem.py

@@ -58,8 +58,5 @@ def updateData():
 timer.timeout.connect(updateData)
 updateData()
 
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/ImageView.py

@@ -63,8 +63,5 @@ imv.setColorMap(cmap)
 imv.ui.roiBtn.setChecked(True)
 imv.roiClicked()
 
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/InfiniteLine.py

@@ -37,9 +37,5 @@ lr = pg.LinearRegionItem(values=[70, 80])
 p1.addItem(lr)
 label = pg.InfLineLabel(lr.lines[1], "region 1", position=0.95, rotateAxis=(1,0), anchor=(1, 1))
 
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/JoystickButton.py

@@ -46,11 +46,5 @@ timer = QtCore.QTimer()
 timer.timeout.connect(update)
 timer.start(30)
     
-    
-
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/Legend.py

@@ -39,8 +39,5 @@ legend.addItem(c1, 'curve1')
 legend.addItem(c2, 'curve2')
 legend.addItem(s1, 'scatter')
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/LogPlotTest.py

@@ -30,8 +30,5 @@ p5.setLabel('bottom', "Y Axis", units='s')
 p5.setLogMode(x=True, y=False)
 
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/MouseSelection.py

@@ -30,8 +30,5 @@ for c in curves:
     win.addItem(c)
     c.sigClicked.connect(plotClicked)
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/MultiPlotSpeedTest.py

@@ -62,8 +62,5 @@ timer = QtCore.QTimer()
 timer.timeout.connect(update)
 timer.start(0)
 
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/MultiPlotWidget.py

@@ -32,9 +32,6 @@ ma = MetaArray(data, info=[
     ])
 pw.plot(ma, pen='y')
 
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()
 

examples/MultiplePlotAxes.py

@@ -60,8 +60,5 @@ p1.plot([1,2,4,8,16,32])
 p2.addItem(pg.PlotCurveItem([10,20,40,80,40,20], pen='b'))
 p3.addItem(pg.PlotCurveItem([3200,1600,800,400,200,100], pen='r'))
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/NonUniformImage.py

@@ -78,9 +78,5 @@ p.setLabel(axis='left', text='Torque [Nm]')
 p.axes['bottom']['item'].setZValue(1000)
 p.axes['left']['item'].setZValue(1000)
 
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/PColorMeshItem.py

@@ -83,8 +83,5 @@ def updateData():
 timer.timeout.connect(updateData)
 updateData()
 
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/PanningPlot.py

@@ -30,8 +30,5 @@ timer = QtCore.QTimer()
 timer.timeout.connect(update)
 timer.start(50)
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/PlotAutoRange.py

@@ -40,10 +40,5 @@ timer = QtCore.QTimer()
 timer.timeout.connect(update)
 timer.start(50)
 
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
-
+    pg.mkQApp().exec_()

examples/PlotSpeedTest.py

@@ -48,10 +48,5 @@ timer = QtCore.QTimer()
 timer.timeout.connect(update)
 timer.start(0)
     
-
-
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/PlotWidget.py

@@ -86,8 +86,5 @@ line = pg.InfiniteLine(angle=90, movable=True)
 pw3.addItem(line)
 line.setBounds([0,200])
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/Plotting.py

@@ -95,8 +95,5 @@ lr.sigRegionChanged.connect(updatePlot)
 p9.sigXRangeChanged.connect(updateRegion)
 updatePlot()
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/ROIExamples.py

@@ -157,15 +157,5 @@ def remove():
     v4.removeItem(r4)
 r4.sigRemoveRequested.connect(remove)
 
-
-
-
-
-
-
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/ROItypes.py

@@ -118,10 +118,5 @@ t = QtCore.QTimer()
 t.timeout.connect(updateImage)
 t.start(50)
 
-
-
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/RemoteGraphicsView.py

@@ -26,9 +26,5 @@ plt = v.pg.PlotItem()
 v.setCentralItem(plt)
 plt.plot([1,4,2,3,6,2,3,4,2,3], pen='g')
 
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/RemoteSpeedTest.py

@@ -72,10 +72,5 @@ timer = QtCore.QTimer()
 timer.timeout.connect(update)
 timer.start(0)
 
-
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/ScaleBar.py

@@ -24,8 +24,5 @@ scale = pg.ScaleBar(size=0.1)
 scale.setParentItem(vb)
 scale.anchor((1, 1), (1, 1), offset=(-20, -20))
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/ScatterPlot.py

@@ -134,9 +134,5 @@ s4.addPoints(
 w4.addItem(s4)
 s4.sigClicked.connect(clicked)
 
-
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/ScatterPlotSpeedTest.py

@@ -128,10 +128,5 @@ param.child('paused').sigValueChanged.connect(lambda _, v: timer.stop() if v els
 timer.timeout.connect(update)
 timer.start(0)
 
-
-# Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/ScatterPlotWidget.py

@@ -62,9 +62,5 @@ spw.setFields([
 spw.setData(data)
 spw.show()
 
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/SimplePlot.py

@@ -5,8 +5,5 @@ import pyqtgraph.exporters
 import numpy as np
 plt = pg.plot(np.random.normal(size=100), title="Simplest possible plotting example")
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if sys.flags.interactive != 1 or not hasattr(pg.QtCore, 'PYQT_VERSION'):
-        pg.QtGui.QApplication.exec_()
+    pg.mkQApp().exec_()

examples/SpinBox.py

@@ -128,8 +128,5 @@ layout.addWidget(changedLabel, 2, 1)
             #s.editingFinished.disconnect()
 
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/Symbols.py

@@ -35,8 +35,5 @@ plot.plot([13, 14, 15, 16, 17], pen=(187, 26, 95), symbolBrush=(187, 26, 95), sy
 plot.plot([14, 15, 16, 17, 18], pen=(248, 187, 208), symbolBrush=(248, 187, 208), symbolPen='w', symbol='arrow_right', symbolSize=22, name="symbol='arrow_right'")
 plot.setXRange(-2, 4)
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/TableWidget.py

@@ -26,9 +26,5 @@ data = np.array([
     
 w.setData(data)
 
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/TreeWidget.py

@@ -48,8 +48,5 @@ i2.addChild(i22)
 b1 = QtGui.QPushButton("Button")
 w.setItemWidget(i1, 1, b1)
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/VideoSpeedTest.py

@@ -272,10 +272,5 @@ timer = QtCore.QTimer()
 timer.timeout.connect(update)
 timer.start(0)
 
-
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/ViewBox.py

@@ -93,8 +93,5 @@ t = QtCore.QTimer()
 t.timeout.connect(updateData)
 t.start(50)
 
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/ViewBoxFeatures.py

@@ -81,10 +81,5 @@ v6.setAutoVisible(x=False, y=True)
 l6 = pg.PlotDataItem(y)
 v6.addItem(l6)
 
-
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/ViewLimits.py

@@ -7,9 +7,5 @@ import numpy as np
 plt = pg.plot(np.random.normal(size=100), title="View limit example")
 plt.centralWidget.vb.setLimits(xMin=-20, xMax=120, minXRange=5, maxXRange=100)
 
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if sys.flags.interactive != 1 or not hasattr(QtCore, 'PYQT_VERSION'):
-        pg.QtGui.QApplication.exec_()
+    pg.mkQApp().exec_()

examples/beeswarm.py

@@ -31,8 +31,5 @@ err = pg.ErrorBarItem(x=np.arange(4), y=data.mean(axis=1), height=data.std(axis=
 win.addItem(err)
 
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/colorMaps.py

@@ -96,8 +96,5 @@ for map_name in list_of_maps:
     
 lw.setFixedHeight(num_bars * (height+5) )
 
-## Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/contextMenu.py

@@ -135,8 +135,5 @@ box2.setParentItem(box1)
 box2.setPos(5, 5)
 box2.setScale(0.2)
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/crosshair.py

@@ -80,8 +80,5 @@ proxy = pg.SignalProxy(p1.scene().sigMouseMoved, rateLimit=60, slot=mouseMoved)
 #p1.scene().sigMouseMoved.connect(mouseMoved)
 
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/customGraphicsItem.py

@@ -54,8 +54,5 @@ plt = pg.plot()
 plt.addItem(item)
 plt.setWindowTitle('pyqtgraph example: customGraphicsItem')
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/customPlot.py

@@ -91,8 +91,5 @@ pw.setWindowTitle('pyqtgraph example: customPlot')
 r = pg.PolyLineROI([(0,0), (10, 10)])
 pw.addItem(r)
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/designerExample.py

@@ -38,9 +38,5 @@ class MainWindow(TemplateBaseClass):
         
 win = MainWindow()
 
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/dockarea.py

@@ -111,8 +111,5 @@ win.show()
 
 
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/fractal.py

@@ -106,10 +106,5 @@ depthSpin.valueChanged.connect(update)
 # Initialize
 update()
 
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
-    
+    pg.mkQApp().exec_()

examples/hdf5.py

@@ -141,15 +141,5 @@ curve = HDF5Plot()
 curve.setHDF5(f['data'])
 plt.addItem(curve)
 
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    
-    
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
-
-
-
-
+    pg.mkQApp().exec_()

examples/histogram.py

@@ -29,8 +29,5 @@ y = pg.pseudoScatter(vals, spacing=0.15)
 #plt2.plot(vals, y, pen=None, symbol='o', symbolSize=5)
 plt2.plot(vals, y, pen=None, symbol='o', symbolSize=5, symbolPen=(255,255,255,200), symbolBrush=(0,0,255,150))
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/imageAnalysis.py

@@ -113,9 +113,5 @@ def imageHoverEvent(event):
 # but it works for a very simple use like this. 
 img.hoverEvent = imageHoverEvent
 
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/infiniteline_performance.py

@@ -44,9 +44,5 @@ timer = QtCore.QTimer()
 timer.timeout.connect(update)
 timer.start(0)
 
-
-# Start Qt event loop unless running in interactive mode.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/isocurve.py

@@ -53,8 +53,5 @@ timer = QtCore.QTimer()
 timer.timeout.connect(update)
 timer.start(50)
     
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/linkedViews.py

@@ -40,10 +40,6 @@ p3.setXLink(p1)
 p3.setLabel('left', "Label to test offset")
 #QtGui.QApplication.processEvents()
 
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()
 

examples/logAxis.py

@@ -34,9 +34,5 @@ p3.plot(x, y)
 
 #p.getAxis('bottom').setLogMode(True)
 
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/multiplePlotSpeedTest.py

@@ -86,8 +86,5 @@ else:
 
 plt.autoRange()
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/multiprocess.py

@@ -51,9 +51,3 @@ d1 = proc.transfer(np.random.normal(size=1000))
 d2 = proc.transfer(np.random.normal(size=1000))
 rpg = proc._import('pyqtgraph')
 plt = rpg.plot(d1+d2)
-
-
-## Start Qt event loop unless running in interactive mode or using pyside.
-#import sys
-#if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-    #QtGui.QApplication.instance().exec_()

examples/optics_demos.py

@@ -159,12 +159,5 @@ timer = QtCore.QTimer()
 timer.timeout.connect(update)
 timer.start(40)
 
-
-
-
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/parametertree.py

@@ -178,9 +178,5 @@ win.show()
 s = p.saveState()
 p.restoreState(s)
 
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/relativity/relativity.py

@@ -750,7 +750,7 @@ class ClockItem(pg.ItemGroup):
         #pass
 
 if __name__ == '__main__':
-    pg.mkQApp()
+    app = pg.mkQApp()
     #import pyqtgraph.console
     #cw = pyqtgraph.console.ConsoleWidget()
     #cw.show()
@@ -759,10 +759,5 @@ if __name__ == '__main__':
     win.setWindowTitle("Relativity!")
     win.show()
     win.resize(1100,700)
-    
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
-    
-    
-    #win.params.param('Objects').restoreState(state, removeChildren=False)
 
+    app.exec_()

examples/relativity_demo.py

@@ -16,8 +16,5 @@ win.resize(1100,700)
 win.show()
 win.loadPreset(None, 'Twin Paradox (grid)')
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(pg.QtCore, 'PYQT_VERSION'):
-        pg.QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/scrollingPlots.py

@@ -109,10 +109,5 @@ timer = pg.QtCore.QTimer()
 timer.timeout.connect(update)
 timer.start(50)
 
-
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/template.py

@@ -15,8 +15,5 @@ app = mkQApp()
 
 # win.setWindowTitle('pyqtgraph example: ____')
 
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/test_ExampleApp.py

@@ -7,7 +7,5 @@ from examples.ExampleApp import ExampleLoader
 
 loader = ExampleLoader()
 
-if __name__ == "__main__":
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+if __name__ == '__main__':
+    pg.mkQApp().exec_()

examples/text.py

@@ -52,10 +52,5 @@ timer = QtCore.QTimer()
 timer.timeout.connect(update)
 timer.start(10)
 
-
-
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

examples/verlet_chain_demo.py

@@ -118,9 +118,5 @@ timer = pg.QtCore.QTimer()
 timer.timeout.connect(update)
 timer.start(16)
 
-    
-## Start Qt event loop unless running in interactive mode or using pyside.
 if __name__ == '__main__':
-    import sys
-    if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
-        QtGui.QApplication.instance().exec_()
+    pg.mkQApp().exec_()

pyqtgraph/widgets/JoystickButton.py

@@ -84,7 +84,7 @@ class JoystickButton(QtGui.QPushButton):
         
         
 if __name__ == '__main__':
-    app = QtGui.QApplication([])
+    app = pg.mkQApp()
     w = QtGui.QMainWindow()
     b = JoystickButton()
     w.setCentralWidget(b)
@@ -96,8 +96,5 @@ if __name__ == '__main__':
         
     b.sigStateChanged.connect(fn)
         
-    ## Start Qt event loop unless running in interactive mode.
-    import sys
-    if sys.flags.interactive != 1:
-        app.exec_()
+    app.exec_()