PyQt5 delete a QListWidgetItem when button in widget is pressed

Question

I have a listWidget that contains multiple QListWidgetItem and for simplicity's sake, let's assume that each QListWidgetItem consists of a QWidget with a QPushButton called delete . This is assembled with this code:

class widgetItem(QtWidgets.QWidget):
    def __init__(self, parent):
        super(widgetItem, self).__init__()
        uic.loadUi('UIfiles/trainingWidget.ui', self) # Load the .ui file

        self.listWidgetItem = QtWidgets.QListWidgetItem()
        self.listWidgetItem.setSizeHint(self.sizeHint())
        self.delete.clicked.connect(self.deleteSelf)
        parent.listWidget.addItem(self.listWidgetItem)
        parent.listWidget.setItemWidget(self.listWidgetItem, self)

and this is called in the main app with this:

def additem(self):
    self.referenceDict[self.itemID] = widgetItem(self)  

Now, my goal is to delete this particular widget from both the referenceDict as well as the listWidget when the button is pressed. Each widgetItem also has their own itemID as a string, and can access the listWidget as well as the referenceDict. How do I write this deleteSelf? I've tried using self.deleteLater but it seems like it only deletes the QWidget but not the QListWidgetItem . Calling self.listWidgetItem.deleteLater raises an attribute error as it cannot be deleted this way. I also tried parent.referenceDict.pop(self.itemID) but for some reason it raises a key error despite both the keys matching when I printed the dict out.

Answer 1

You can remove listitems using the takeItem method and delete widgets using the deleteLater method.

I wasn't to fond of your chosen process for creating the widgets and adding them to the list, so I went ahead and created a minimal example but using QPushButton instead of QWidgets for the itemWidgets.

Example:

from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *

class Window(QWidget):

    def __init__(self, parent=None):
        super().__init__(parent=parent)
        self.layout = QVBoxLayout()
        self.setLayout(self.layout)
        self.listWidget = QListWidget(self)
        self.layout.addWidget(self.listWidget)
        self.addListItems()

    def addListItems(self):           # creates the item widgets
        for _ in range(5):
            item = QListWidgetItem(type=0)
            widget = ListItem("button", self, item)
            self.listWidget.addItem(item)
            self.listWidget.setItemWidget(item, widget)

    def removeWidgetItem(self, item):  # removes the item widgets
        index = self.listWidget.indexFromItem(item).row()
        item = self.listWidget.takeItem(index)

class ListItem(QPushButton):

    def __init__(self, text, parent, item):
        super().__init__(text, parent)
        self.item = item                     # the ListWidgetItem
        self._parent = parent                # the Window
        self.clicked.connect(self.deleteSelf)

    def deleteSelf(self):                    # slot for button click
        self._parent.removeWidgetItem(self.item)
        self.deleteLater()

app = QApplication([])
window = Window()
window.show()
app.exec()