为何InputDialog弹不出来

[qq_43357943]

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import *



class Ui_Dialog(object):

def setupUi(self, Dialog):

Dialog.setObjectName("Dialog")
Dialog.resize(524, 371)
self.pushButton = QtWidgets.QPushButton(Dialog)
self.pushButton.setGeometry(QtCore.QRect(190, 100, 75, 23))
self.pushButton.setObjectName("pushButton")


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


def msg(self):

print('hello')
text, ok =QInputDialog.getText(self, '输入文本框', '请输入您的文本内容')


def retranslateUi(self, Dialog):
_translate = QtCore.QCoreApplication.translate
Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
self.pushButton.setText(_translate("Dialog", "PushButton"))



if __name__ == "__main__":
import sys
app=QApplication(sys.argv)
dialog=QDialog()
ui=Ui_Dialog()
ui.setupUi(dialog)

dialog.show()
sys.exit(app.exec_())