PyQt5. QTabWidget. How to customize a separate tab?

Question

Python

I make tabs with text in the manner of chrom. I want a special tab, when I change to which, I will create new tabs. It cannot be closed, it is always on the right. Now I'm struggling with the question of deleting the close button from this (only from it) tab. Tried to use tabBar() but if I understood correctly it is for pyqt4. Or not. Help I'm stuck

class Tabs(QTabWidget):

    quantity = 10
    tabs = [["File" + str(i), None] for i in range(1, quantity)]
    def __init__(self):
        super().__init__()
        self.new_button = QFrame()
        self.addTab(self.new_button, "NEW")
        self.new_tab()
        self.new_tab()

        self.setTabsClosable(True)
        self.setMovable(True)
        #self.tabBar().setTabButton(0, self.currentIndex(0).RightSide, None)

        self.tabCloseRequested.connect(self.delete_tab)
        self.currentChanged.connect(self.change_new_tab)
   ...

Answer 1

I changed the commented line to

self.tabBar().setTabButton(0, self.tabBar().RightSide, None)

and the problem with the extra button is gone

Answer 2

You need to make two classes: one describes a regular tab (one, the class itself describes one tab), and the second is an opening one.
And then add instances of these classes to the parent widget