Update to use qtpy for PyQt6/PySide6 support via shim.

Author: mfitzp

qtwidgets/color_duo/color_duo.py

@@ -14,7 +14,7 @@ class ColorButton(QtWidgets.QPushButton):
     Custom Qt Widget to show a chosen color.
 
     Left-clicking the button shows the color-chooser, while
-    right-clicking resets the color to None (no-color).
+    right-clicking resets the color to the default color (None by default).
     '''
 
     colorChanged = Signal(object)

qtwidgets/color_duo/demo_pyqt5.py

@@ -1,4 +1,4 @@
-from PyQt5 import QtWidgets
+from qtpy import QtWidgets
 from qtwidgets import ColorButton
 
 

qtwidgets/color_duo/demo_pyside2.py

@@ -1,4 +1,4 @@
-from PySide2 import QtCore, QtWidgets
+from qtpy import QtCore, QtWidgets
 from qtwidgets import EqualizerBar
 
 import random