How to update QListWidget - pyqt4

Question

How to update QLIstWidget to show items as when when it is added.
Like i am adding 100 QListWidgetItems to QListWidget in a loop. All these 100 items are visible only after loop is completed. But i want to know if is it possible to show item as and when the item is added.
I tried self.ListWidget.setUpdatesEnabled(True) but no luck.
Any help is appreciated.

Answer 1

you can repaint the listwidget in the loop:
def insertItem(self):
for i in range(1,100):
self.listWidget.addItem(str(i))
self.listWidget.repaint()
with QTimer you can control the delay between 2 items.
Edit: Perhaps i didn't understand your question correctly:
you can add all items, hide them and then set them visible item by item:
import sys
from PyQt5 import QtGui, QtCore, QtWidgets
class MyWidget(QtWidgets.QWidget):
def __init__(self):
QtWidgets.QWidget.__init__(self)
self.setGeometry(200,100,600,900)
self.listWidget = QtWidgets.QListWidget(self)
self.listWidget.setGeometry(20,20,100,700)
self.pushButton = QtWidgets.QPushButton(self)
self.pushButton.setGeometry(20,800,100,30)
self.pushButton.setText('show Items')
self.pushButton.clicked.connect(self.showItems)
self.timer = QtCore.QTimer()
for i in range(0,100):
self.listWidget.addItem(str(i))
self.listWidget.item(i).setHidden(True)
self.z = 0
def showItems(self):
self.timer.start(100)
self.timer.timeout.connect(self.nextItem)
def nextItem(self):
try:
self.listWidget.item(self.z).setHidden(False)
self.listWidget.repaint()
self.z += 1
except AttributeError:
self.timer.stop()
self.z = 0
app = QtWidgets.QApplication(sys.argv)
widget = MyWidget()
widget.show()
sys.exit(app.exec_())
in pyqt4 replace 'QtWidgets' by 'QtGui'