pyqt5制作python 关机GUI，os.system('shutdown -s -t 60')无法运行

[阿白在哪里]

这是GUI类

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

# Form implementation generated from reading ui file 'shutdown.ui'
#
# Created by: PyQt5 UI code generator 5.11.2
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_shutdown(object):
    def setupUi(self, shutdown):
        shutdown.setObjectName("shutdown")
        shutdown.resize(301, 192)
        font = QtGui.QFont()
        font.setBold(True)
        font.setWeight(75)
        shutdown.setFont(font)
        self.centralwidget = QtWidgets.QWidget(shutdown)
        self.centralwidget.setObjectName("centralwidget")
        self.label = QtWidgets.QLabel(self.centralwidget)
        self.label.setGeometry(QtCore.QRect(110, 60, 21, 16))
        font = QtGui.QFont()
        font.setPointSize(15)
        self.label.setFont(font)
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(self.centralwidget)
        self.label_2.setGeometry(QtCore.QRect(190, 60, 41, 16))
        font = QtGui.QFont()
        font.setPointSize(15)
        self.label_2.setFont(font)
        self.label_2.setObjectName("label_2")
        self.lineEdit = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit.setGeometry(QtCore.QRect(50, 60, 51, 20))
        self.lineEdit.setObjectName("lineEdit")
        self.lineEdit_3 = QtWidgets.QLineEdit(self.centralwidget)
        self.lineEdit_3.setGeometry(QtCore.QRect(130, 60, 51, 20))
        self.lineEdit_3.setObjectName("lineEdit_3")
        self.pushButton = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton.setGeometry(QtCore.QRect(40, 110, 75, 23))
        self.pushButton.setObjectName("pushButton")
        self.pushButton_2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton_2.setGeometry(QtCore.QRect(160, 110, 75, 23))
        self.pushButton_2.setObjectName("pushButton_2")
        shutdown.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(shutdown)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 301, 23))
        self.menubar.setObjectName("menubar")
        shutdown.setMenuBar(self.menubar)
        self.statusbar = QtWidgets.QStatusBar(shutdown)
        self.statusbar.setObjectName("statusbar")
        shutdown.setStatusBar(self.statusbar)

        self.retranslateUi(shutdown)
        QtCore.QMetaObject.connectSlotsByName(shutdown)

    def retranslateUi(self, shutdown):
        _translate = QtCore.QCoreApplication.translate
        shutdown.setWindowTitle(_translate("shutdown", "shutdown"))
        self.label.setText(_translate("shutdown", "H"))
        self.label_2.setText(_translate("shutdown", "min"))
        self.pushButton.setText(_translate("shutdown", "关机"))
        self.pushButton_2.setText(_translate("shutdown", "取消"))

下面是实例

from PyQt5 import QtCore, QtGui, QtWidgets
import sys,time,os
from shutdown import Ui_shutdown
class myshutdown(Ui_shutdown):
    def __init__(self,shutdown):
        super().setupUi(shutdown)
        self.pushButton.clicked.connect(self.shut)
        self.pushButton_2.clicked.connect(self.dis)
    def shut(self):
        h = int(self.lineEdit.text())
        m = int(self.lineEdit_3.text())
        H=int(time.strftime('%H',time.localtime()))
        M=int(time.strftime('%M',time.localtime()))
        print(m)
        if H>h:
            h = h+24
        if  M<=m: 
            c=(h-H)*3600+(m-M)*60
        else:
             c=(h-1-H)*3600+(60+m-M)*60
        os.system('shutdown -s -t %d'%c)
        print(h,m,H,M,c)
    def dis(self):
        os.system('shutdown -a')







if __name__ == "__main__":
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = myshutdown(MainWindow)
    
    MainWindow.show()
    sys.exit(app.exec_())

运行时命令框一闪而过，并未关机

[tianfang]

os.system('shutdown -s -t %d'%c) -》 os.system('cmd shutdown /s -t %d'%c)