Minimal example of how to use a custom context menu and add actions to it.

custom_context_menu.py

import sys

from PyQt5.QtWidgets import QApplication, QMainWindow, QTextEdit, QMenu, QAction
from PyQt5.QtGui import QCursor
from PyQt5.QtCore import Qt

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()
        self.text_edit = QTextEdit()
        self.text_edit.setContextMenuPolicy(Qt.CustomContextMenu)

        self.text_edit.customContextMenuRequested.connect(self.context_menu)

        self.setCentralWidget(self.text_edit)

    def context_menu(self):
        menu = QMenu(self)
        action1 = QAction("First option")
        action1.triggered.connect(lambda: print("You have clicked the first option"))
        
        action2 = QAction("Second option")
        action2.triggered.connect(lambda: print("You have clicked the second option"))
           
        menu.addAction(action1)
        menu.addAction(action2)

        menu.exec_(QCursor.pos())


if __name__ == "__main__":
    app = QApplication(sys.argv)

    window = MainWindow()
    window.show()

    sys.exit(app.exec_())

Thanks friend. This helped me a lot.