The colorbutton widget is not yet compatible with PyQt6 and PySide6, so some widgets are not available (see the screenshot below).

colorbutton import can be made common by "from qtpy.QtCore import Qt, Signal" (ref: https://github.com/spyder-ide/qtpy#module-aliases-and-constants)

I think this issue can be resolved in #8 pull request. Could you please review and merge it? @mfitzp