Pyside6

[Axel_Erfurt]

Is this statement still used when you have, for example, a screen with many widgets, panels, etc. each related, but somewhat independant of the other?

If you have more widgets use layouts.

I've added some widgets to your code for example

import sys
from PySide6.QtWidgets import (QApplication, QMainWindow,
        QWidget, QTableWidget, QTableWidgetItem, QHeaderView,
        QHBoxLayout, QVBoxLayout, QTextEdit, QSizePolicy)
 
from PySide6.QtGui import QPalette, QColor
 
 
class MainWindow(QMainWindow):
    def __init__(self):
        super(MainWindow, self).__init__()
 
        self.setWindowTitle("Table Widget")
        self.table = Table()
        self.table.setSizePolicy(QSizePolicy.Fixed, QSizePolicy.Preferred)
        self.table.define_table()
        self.table.itemSelectionChanged.connect(self.get_cell)
        
        # hbox layout
        hbox = QHBoxLayout()
        hbox.addWidget(self.table)
        
        # add textedit right to table
        self.text_edit = QTextEdit(plainText = "Hello World")
        
        hbox.addWidget(self.text_edit)
        
        #vbox layout
        vbox = QVBoxLayout()
        
        # add hbox to vbox
        vbox.addLayout(hbox)
        
        # add textedit below table
        self.another_text_edit = QTextEdit(plainText = "Hello World")
        vbox.addWidget(self.another_text_edit)
        
        # central widget
        central_widget = QWidget()
        central_widget.setLayout(vbox)
        
        self.setCentralWidget(central_widget)
        self.statusBar().showMessage("Ready")
        
    def get_cell(self):
        widget = self.table
        index = widget.selectedItems()[0]
        cell_text = widget.item(index.row(), index.column()).text()
        self.statusBar().showMessage(f"cell text: {cell_text}")
 
 
class Table(QTableWidget):
    def __init__(self, parent=None):
        super(Table, self).__init__(parent)
 
        self.colors = [("Red", "#FF0000"),
                ("Green", "#00FF00"),
                ("Blue", "#0000FF"),
                ("Black", "#000000"),
                ("White", "#FFFFFF"),
                ("Electric Green", "#41CD52"),
                ("Dark Blue", "#222840"),
                ("Yellow", "#F9E56d")]
 
    def get_rgb_from_hex(self, code):
        code_hex = code.replace("#", "")
        rgb = tuple(int(code_hex[i:i+2], 16) for i in (0, 2, 4))
        return QColor.fromRgb(rgb[0], rgb[1], rgb[2])
 
    def define_table(self):
        self.setItemDelegate(self.itemDelegate())
        self.setRowCount(len(self.colors))
        self.setColumnCount(len(self.colors[0]) + 1)
        self.setHorizontalHeaderLabels(["Name", "Hex Code", "Color"])
         
        for i, (name, code) in enumerate(self.colors):
            item_name = QTableWidgetItem(name)
            item_code = QTableWidgetItem(code)
            item_color = QTableWidgetItem()
            item_color.setBackground(self.get_rgb_from_hex(code))
            self.setItem(i, 0, item_name)
            self.setItem(i, 1, item_code)
            self.setItem(i, 2, item_color)
 
        hh = self.horizontalHeader()
        hh.setSectionResizeMode(QHeaderView.ResizeToContents)
 
 
def main():
    app = QApplication(sys.argv)
    window = MainWindow()
    window.setGeometry(100, 100, 600, 500)
    window.show()
    app.exec()
 
 
if __name__ == '__main__':
    main()