Frame

main.py

class WidgetFrame(QWidget):
    def __init__(self):
        super().__init__()

        self.createTable()

        # Add box layout, add table to box layout and add box layout to widget
        self.layout = QVBoxLayout()
        self.layout.addWidget(self.tableWidget) 
        self.setLayout(self.layout) 

        # Show widget
        self.show()

    def createTable(self):
       # Create table
        self.tableWidget = QTableWidget()
        self.tableWidget.setHorizontalHeaderLabels(["Header 1", "Header 2", "Header 3"])
        self.tableWidget.setRowCount(4)
        self.tableWidget.setColumnCount(3)
        self.tableWidget.setItem(0,0, QTableWidgetItem("Cell (1,1)"))
        self.tableWidget.setItem(0,1, QTableWidgetItem("Cell (1,2)"))
        self.tableWidget.setItem(1,0, QTableWidgetItem("Cell (2,1)"))
        self.tableWidget.setItem(1,1, QTableWidgetItem("Cell (2,2)"))
        self.tableWidget.setItem(2,0, QTableWidgetItem("Cell (3,1)"))
        self.tableWidget.setItem(2,1, QTableWidgetItem("Cell (3,2)"))
        self.tableWidget.setItem(3,0, QTableWidgetItem("Cell (4,1)"))
        self.tableWidget.setItem(3,1, QTableWidgetItem("Cell (4,2)"))
        self.tableWidget.move(0,0)

        # table selection change
        self.tableWidget.doubleClicked.connect(self.on_click)