from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_MainWindow(object):def setupUi(self, MainWindow):MainWindow.setObjectName("MainWindow")MainWindow.resize(290, 117)self.centralwidget = QtWidgets.QWidget(MainWindow)self.centralwidget.setObjectName("centralwidget")MainWindow.setCentralWidget(self.centralwidget)self.menubar = QtWidgets.QMenuBar(MainWindow)self.menubar.setGeometry(QtCore.QRect(0, 0, 290, 23))self.menubar.setObjectName("menubar")MainWindow.setMenuBar(self.menubar)self.statusbar = QtWidgets.QStatusBar(MainWindow)self.statusbar.setObjectName("statusbar")MainWindow.setStatusBar(self.statusbar)self.retranslateUi(MainWindow)QtCore.QMetaObject.connectSlotsByName(MainWindow)def retranslateUi(self, MainWindow):_translate = QtCore.QCoreApplication.translateMainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
import sys
# 主方法，程序从此处启动PyQt设计的窗体
if __name__ == '__main__':app = QtWidgets.QApplication(sys.argv)app.setStyle("Fusion") # 设置窗口风格MainWindow = QtWidgets.QMainWindow() # 创建窗体对象ui = Ui_MainWindow() # 创建PyQt设计的窗体对象ui.setupUi(MainWindow) # 对窗体对象进行初始化设置MainWindow.show() # 显示窗体sys.exit(app.exec_()) # 程序关闭时退出进程

from PyQt5 import QtWidgets,QtGui,QtCore
from py文件名 import 类名
class MainWindow(QtWidgets.QMainWindow, 类名):def __init__(self, parent=None):super(MainWindow, self).__init__(parent)self.setupUi(self)# 此处编写业务逻辑代码
if __name__ == "__main__":import sysapp = QtWidgets.QApplication(sys.argv)mainWindow = MainWindow()mainWindow.show()sys.exit(app.exec_())