[Python] How does QtAsyncio.run() know what to run?

Full code for this example is below. I'm more interested in this part:

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

QtAsyncio.run()


How does QtAsyncio.run() know what to run? nothing is passed to it.

# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

from PySide6.QtCore import Qt
from PySide6.QtWidgets import (QApplication, QLabel, QMainWindow, QPushButton, QVBoxLayout, QWidget)

import PySide6.QtAsyncio as QtAsyncio

import asyncio
import sys


class MainWindow(QMainWindow):

def __init__(self):
super().__init__()

widget = QWidget()
self.setCentralWidget(widget)

layout = QVBoxLayout(widget)

self.text = QLabel("The answer is 42.")
layout.addWidget(self.text, alignment=Qt.AlignmentFlag.AlignCenter)

async_trigger = QPushButton(text="What is the question?")
async_trigger.clicked.connect(lambda: asyncio.ensure_future(self.set_text()))
layout.addWidget(async_trigger, alignment=Qt.AlignmentFlag.AlignCenter)

async def set_text(self):
await asyncio.sleep(1)
self.text.setText("What do you get if you multiply six by nine?")


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

QtAsyncio.run()

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