pyqt如何实现多窗口同时调用比如About

S1创建About窗口

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'D:\PythonProject\NakedSomaTool\About.ui'
#
# Created by: PyQt5 UI code generator 5.6
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Dialog(object):
    def setupUi(self, Dialog):
        Dialog.setObjectName("Dialog")
        Dialog.setEnabled(True)
        Dialog.resize(622, 126)
        sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Preferred, QtWidgets.QSizePolicy.Preferred)
        sizePolicy.setHorizontalStretch(0)
        sizePolicy.setVerticalStretch(0)
        sizePolicy.setHeightForWidth(Dialog.sizePolicy().hasHeightForWidth())
        Dialog.setSizePolicy(sizePolicy)
        Dialog.setSizeGripEnabled(True)
        self.frame = QtWidgets.QFrame(Dialog)
        self.frame.setGeometry(QtCore.QRect(10, 10, 651, 101))
        self.frame.setFrameShape(QtWidgets.QFrame.StyledPanel)
        self.frame.setFrameShadow(QtWidgets.QFrame.Raised)
        self.frame.setObjectName("frame")
        self.label = QtWidgets.QLabel(self.frame)
        self.label.setEnabled(True)
        self.label.setGeometry(QtCore.QRect(10, 20, 50, 50))
        self.label.setMinimumSize(QtCore.QSize(50, 0))
        self.label.setMaximumSize(QtCore.QSize(50, 16777215))
        self.label.setText("")
        self.label.setPixmap(QtGui.QPixmap("resource/logo.png"))
        self.label.setScaledContents(True)
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(self.frame)
        self.label_2.setGeometry(QtCore.QRect(70, 20, 394, 57))
        self.label_2.setObjectName("label_2")
        self.pushButton = QtWidgets.QPushButton(self.frame)
        self.pushButton.setGeometry(QtCore.QRect(490, 30, 93, 28))
        self.pushButton.setObjectName("pushButton")

        self.retranslateUi(Dialog)
        self.pushButton.clicked.connect(Dialog.close)
        QtCore.QMetaObject.connectSlotsByName(Dialog)

    def retranslateUi(self, Dialog):
        _translate = QtCore.QCoreApplication.translate
        Dialog.setWindowTitle(_translate("Dialog", "About"))
        self.label_2.setText(_translate("Dialog", "
Copyright 生物医学跨学科研究中心
2019-2025
"))
        self.pushButton.setText(_translate("Dialog", "关闭"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Dialog = QtWidgets.QDialog()
    ui = Ui_Dialog()
    ui.setupUi(Dialog)
    Dialog.show()
    sys.exit(app.exec_())

S2在主窗口中进行调用

# -*- coding: utf-8 -*-

"""
Module implementing MainWindow.
"""




import sys
from PyQt5.QtCore import pyqtSlot
from PyQt5.QtWidgets import QMainWindow, QApplication,  QDialog
from PyQt5 import QtWidgets

from Ui_MainWindow import Ui_MainWindow
import qdarkstyle
from Ui_About import Ui_Dialog
import threading


class MainWindow(QMainWindow, Ui_MainWindow):
    """
    Class documentation goes here.
    """
    def __init__(self, parent=None):
        """
        Constructor
        
        @param parent reference to the parent widget
        @type QWidget
        """
        super(MainWindow, self).__init__(parent)
        self.setupUi(self)
    
    @pyqtSlot()
    def on_btnPlay1_clicked(self):
        """
        Slot documentation goes here.
        """
        # TODO: not implemented yet
        raise NotImplementedError
    
    @pyqtSlot()
    def on_btnPlay2_clicked(self):
        """
        Slot documentation goes here.
        """
        # TODO: not implemented yet
        raise NotImplementedError
    
    @pyqtSlot()
    def on_btnPlay3_clicked(self):
        """
        Slot documentation goes here.
        """
        # TODO: not implemented yet
        raise NotImplementedError
    
    @pyqtSlot()
    def on_btnPlay4_clicked(self):
        """
        Slot documentation goes here.
        """
        # TODO: not implemented yet
        raise NotImplementedError
    
    @pyqtSlot()
    def on_btnLoad_clicked(self):
        """
        Slot documentation goes here.
        """
        # TODO: not implemented yet
        raise NotImplementedError
    
    @pyqtSlot()
    def on_btnConfirm_clicked(self):
        """
        Slot documentation goes here.
        """
        # TODO: not implemented yet
        raise NotImplementedError
    
    @pyqtSlot()
    def on_btnOutput_clicked(self):
        """
        Slot documentation goes here.
        """
        # TODO: not implemented yet
        raise NotImplementedError




class AboutChild(QDialog, Ui_Dialog):
    def __init__(self):
        super(AboutChild, self).__init__()
        self.setupUi(self)
        #self.pushButton.clicked.connect(self.close)
    def OPEN(self):
        self.show()


if __name__ == "__main__":
    app = QApplication(sys.argv)
    window = MainWindow()
    about = AboutChild()

    # setup stylesheet
    app.setStyleSheet(qdarkstyle.load_stylesheet_pyqt5())
    window.show()
    window.actionAbout.triggered.connect(about.OPEN)
    sys.exit(app.exec_())