如何使QMainWindow居中？

from PyQt5.QtWidgets import QApplication, QMainWindow, QDesktopWidget

app = QApplication([])
window = QMainWindow()

# 设置窗口大小
window.resize(800, 600)

# 计算屏幕的中心点
center_point = QDesktopWidget().availableGeometry().center()

# 将窗口移动到屏幕中心
window.move(center_point - window.rect().center())

window.show()
app.exec_()

from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5.QtGui import QScreen, QGuiApplication

app = QApplication([])
window = QMainWindow()

# 设置窗口大小
window.resize(800, 600)

# 获取主屏幕
screen = QGuiApplication.primaryScreen()

# 获取主屏幕的几何属性
screen_geometry = screen.availableGeometry()

# 计算屏幕的中心点
center_point = screen_geometry.center()

# 将窗口移动到屏幕中心
window.move(center_point - window.rect().center())

window.show()
app.exec_()