QTabBar Indexing is wrong for right mouse click

[xenas]

Hi Axel,

partial are part of the import module that I did not added in my above code.
And so it should be (I can't seem to find the 'edit; to my post):

from functools import partial

class MyWin(QtGui.QMainWindow):
    def __init__(self, parent=None):
        super(MyWin, self).__init__()
        central_widget = QtGui.QWidget()
        self.setCentralWidget(central_widget)
        vlay = QtGui.QVBoxLayout(central_widget)
        hlay = QtGui.QHBoxLayout()
        vlay.addLayout(hlay)
        vlay.addStretch()
 
        self.add_button = QtGui.QToolButton()
        self.tab_bar = QtGui.QTabBar(self)
        self.add_button.setIcon(QtGui.QIcon('add.png'))
        self.add_button.setMenu(self.set_menu())
        self.add_button.setPopupMode(QtGui.QToolButton.InstantPopup)
 
        self.tab_bar.setTabButton(
            0,
            QtGui.QTabBar.ButtonPosition.RightSide,
            self.add_button
        )
        hlay.addWidget(self.add_button)
        hlay.addWidget(self.tab_bar)
 
    def set_menu(self):
        menu_options = ['food', 'drinks', 'snacks']
        qmenu = QtGui.QMenu(self.add_button)
        for opt in menu_options:
            qmenu.addAction(opt, partial(self.set_new_tab, opt))
        qmenu.addAction
        return qmenu
 
    def set_new_tab(self, opt):
        self.tab_bar.addTab(opt)
 
    def mousePressEvent(self, event):
        if event.button() == QtCore.Qt.RightButton:
            index = self.tab_bar.tabAt(event.pos())
            print index
            menu = QtGui.QMenu(self)
            action = menu.addAction('Remove tab', partial(self.removal_tab, index))
        else:
            super(MyWin, self).mousePressEvent(event)
     
    def removal_tab(self, index):
        self.tab_bar.removeTab(index)
 
 
my_win = MyWin()
my_win.show()

opt is part of the menu options as stated in line 28.
This is a complete code despite I did not added in the execution code as you have defined, as the tool is still operatable.