Unable to iterate a list to a thread - pyqt5

Question

I am trying to pass a json return between functions but I get errors. So I convert the json to a list. However, I cannot iterate the list from a while loop unless I specify an actual number.
Full code is
class BackendThread(QThread):
update_date = pyqtSignal(list)
def run(self):
device_mode = []
while True:
#do stuff and get json_return
for xx in json_return["result"]["devices"]:
for y in xx["nodes"]:
if y['type'] == "FRAME_BUFFER":
data = xx["device_id"] + "\n" + y['configuration']['display_mode']
device_mode.append(data)
self.update_date.emit(str(device_mode))
device_mode = []
time.sleep(1)
class Window(QDialog):
def __init__(self):
QDialog.__init__(self)
self.resize(400,400)
self.input=QTextEdit(self)
self.input.resize(400,400)
self.initUI()
def initUI(self):
self.backend=BackendThread()
self.backend.update_date.connect(self.handleDisplay)
self.backend.start()
def handleDisplay(self,data):
count = 0
while count < 11:
self.input.setText(data[count])
count += 1
if __name__ == '__main__':
app=QApplication(sys.argv)
win =Window()
win.show()
sys.exit(app.exec_())
So this part does not work. I only get the last item in the list
count = 0
while count < 11:
self.input.setText(data[count])
count += 1
When I do this, it works but I cannot hard code the item number becuase the list will never have the same amount of items
self.input.setText(data[0])
self.input.setText(data[1])
self.input.setText(data[2])
etc
Any ideas as to how to get that while loop working?