单击Python Maya时在menuItem上显示窗口

import maya.cmds as cmds
import maya.OpenMayaUI as omui
from PySide2 import QtWidgets
from shiboken2 import wrapInstance

def show_window():
    # 创建主窗口
    main_win = QtWidgets.QMainWindow(parent=get_maya_main_window())
    main_win.setWindowTitle("My Window")
    
    # 创建布局
    layout = QtWidgets.QVBoxLayout()
    central_widget = QtWidgets.QWidget()
    central_widget.setLayout(layout)
    main_win.setCentralWidget(central_widget)
    
    # 添加控件
    label = QtWidgets.QLabel("Hello, World!")
    layout.addWidget(label)
    
    # 显示窗口
    main_win.show()

def get_maya_main_window():
    # 获取Maya的主窗口指针
    maya_main_window_ptr = omui.MQtUtil.mainWindow()
    maya_main_window = wrapInstance(long(maya_main_window_ptr), QtWidgets.QWidget)
    
    return maya_main_window

# 在Maya菜单中创建一个menuItem，并绑定回调函数
cmds.menuItem(label="Show Window", command=show_window)