自分用 QtDesigner Template

import maya.cmds as cmds
from PySide2 import QtWidgets
from PySide2.QtUiTools import QUiLoader
from maya.app.general import mayaMixin
from shiboken2 import wrapInstance
import maya.OpenMayaUI as omui
import os


# relese
module_path = cmds.getModulePath(moduleName='Sample')
path = module_path + 'test_gui.ui'


def get_maya_window():
    """GUIのwindowの親を取得する関数

    Returns:
        maya_window:GUIの親を返しています。
    """
    main_window_ptr = omui.MQtUtil.mainWindow()
    return wrapInstance(int(main_window_ptr), QtWidgets.QWidget)


class ExecuteDirectoryGUI(mayaMixin.MayaQWidgetBaseMixin, QtWidgets.QMainWindow):
    """GUI main
    """

    def __init__(self, parent=get_maya_window()):
        super(ExecuteDirectoryGUI, self).__init__(parent)
        window_list = self.parent().children()
        for child in window_list:
            if self.__class__.__name__ == child.__class__.__name__:
                if child.isVisible():
                    child.close()

        self.ui = QUiLoader().load(path)
        # self.setWindowTitle('Sample')
        self.setEnabled(True)
        self.setFixedSize(400, 150)
        # self.resize(400, 200)
        self.setCentralWidget(self.ui)

    def GUI(self):

        self.show()