Nicer checkbox for Python Qt bindings named NiceCheckbox.
There is also possibility of having icons in checker. To allow this pass keyword argument draw_icons=True to NiceCheckbox constructor or call set_draw_icons method on created object my_checkbox.set_draw_icons(True/False).
By default is widget expanding but I would recommend to set fixed size of checkbox and use at least 12px height otherwise is widget barely visible and at least 20px when icons should be drawn.
Project is using Python module Qt.py which support bindings for PySide2, PyQt5, PySide and PyQt4. (Tested only with PySide2)