QtPy is a compatibility layer which allows to use the code written for
PyQt5 with any python Qt binding: PyQt4, PyQt5, pyside or pyside2.
Main differences in PyQt5:
- all widget classes are now in QtWidgets package, not QtGui;
- QString obsoleted by unicode (sip API 2);
- changed the way of signals connection.
Closes: #1191
- Use MyForm.statusbar set in __init__ instead of MyForm.statusBar()
- MyForm.updateStatusBar() to show the message in MyForm methods
- queues.UISignalQueue.put(('updateStatusBar', msg)) in dialogs