import os
import sys

from PySide2.QtGui import *
from PySide2.QtCore import *
from PySide2.QtWidgets import *

class RestrictedHeaderView(QHeaderView):
    def __init__(self, cols, parent=None):
        super().__init__(Qt.Horizontal, parent)
        self.visibleColumns = cols
    def sectionsInserted(self, parent, logicalFirst, logicalLast):
        if not parent.isValid() and logicalLast >= self.visibleColumns:
            for col in range(visibleColumns, logicalLast + 1):
                self.hideSection(col)


class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()

        # Init TableView
        self.table = QTableView()
        my_headers = ["H-1", "H-2", "H-3"]
        my_col_ct = len(my_headers)
        self.mdl_table = QStandardItemModel(0, my_col_ct) # 0 rows, n columns
        self.table.setModel(self.mdl_table)
        header = RestrictedHeaderView(5, parent=self)
        self.table.setHorizontalHeader(header)

def main():
    qt_app = QApplication(sys.argv)
    my_main_window = MainWindow()
    my_main_window.show()
    sys.exit(qt_app.exec_())


if __name__ == '__main__':
    main()