main.py

from PySide6 import QtWidgets
from PySide6.QtWidgets import QApplication, QWidget, QMainWindow
import sys

#Internal Imports
from MainScreen import*

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

        self.deleteButton_list.clicked.connect(self.delete_cond_to_add)
        self.addConButton.clicked.connect(self.add_condition)
        self.deleteButton_tree.clicked.connect(self.tree_delete)
    def tree_delete(self):
        try:
            root = self.treeWidget_log_op.invisibleRootItem()
            for item in self.treeWidget_log_op.selectedItems():
                (item.parent() or root).removeChild(item)
        except:
            print("ERROR: Unable to Delete Tree Object")
            print("SOLUTION: Unknown")


        #index = self.treeWidget_log_op.indexFromItem(object_to_del).text()
        #print(index)

       # self.treeWidget_log_op.removeItemWidget(object_to_del,0)

    def delete_cond_to_add(self):
        index = self.listWidget_condition.currentRow()
        self.listWidget_condition.takeItem(index)
    def add_condition(self):
        #takeItem(row)
        print("add tehe")
        string_val = ""
        for i in range(( self.listWidget_condition.count())):
            list_object = self.listWidget_condition.item(i)
            string_val += " " + list_object.text()

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

    window = MainWindow()
    window.show()

    # Start the event loop.
    app.exec()