pyqt 实现计算器

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已于 2023-07-13 11:16:13 修改 · 734 阅读

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#pyqt

于 2023-07-13 09:52:39 首次发布

本文展示了如何使用PyQt5创建一个简单的GUI计算器，包括设计UI界面、实例化计算器类以及添加按钮点击事件处理逻辑，如加减乘除操作。QApplication负责管理程序的主循环和事件处理，确保窗口系统的正常运行。

1.由designer设计实现的计算器类

文件名为：untitled.py

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

# Form implementation generated from reading ui file 'untitled.ui'
#
# Created by: PyQt5 UI code generator 5.15.9
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.


from PyQt5 import QtCore, QtGui, QtWidgets


class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(241, 341)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.lcdNumber = QtWidgets.QLCDNumber(self.centralwidget)
        self.lcdNumber.setGeometry(QtCore.QRect(30, 40, 151, 31))
        font = QtGui.QFont()
        font.setBold(False)
        font.setUnderline(False)
        font.setWeight(50)
        font.setStrikeOut(False)
        self.lcdNumber.setFont(font)
        self.lcdNumber.setDigitCount(10)
        self.lcdNumber.setMode(QtWidgets.QLCDNumber.Dec)
        self.lcdNumber.setObjectName("lcdNumber")
        self.pushButton1 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton1.setGeometry(QtCore.QRect(30, 110, 31, 21))
        font = QtGui.QFont()
        font.setBold(True)
        font.setUnderline(False)
        font.setWeight(75)
        self.pushButton1.setFont(font)
        self.pushButton1.setObjectName("pushButton1")
        self.pushButton2 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton2.setGeometry(QtCore.QRect(70, 110, 31, 21))
        font = QtGui.QFont()
        font.setBold(True)
        font.setUnderline(False)
        font.setWeight(75)
        self.pushButton2.setFont(font)
        self.pushButton2.setObjectName("pushButton2")
        self.pushButton3 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton3.setGeometry(QtCore.QRect(110, 110, 31, 21))
        font = QtGui.QFont()
        font.setBold(True)
        font.setUnderline(False)
        font.setWeight(75)
        self.pushButton3.setFont(font)
        self.pushButton3.setObjectName("pushButton3")
        self.pushButton4 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton4.setGeometry(QtCore.QRect(30, 140, 31, 21))
        font = QtGui.QFont()
        font.setBold(True)
        font.setUnderline(False)
        font.setWeight(75)
        self.pushButton4.setFont(font)
        self.pushButton4.setObjectName("pushButton4")
        self.pushButton8 = QtWidgets.QPushButton(self.centralwidget)
        self.pushButton8.setGeometry(QtCore.QRect(70, 170, 31, 21))
        font = QtGui.QFont()
        font.setBold(True)
        font.setUnderline(False)
        font.setWeight(75)
        self.pushButton8.setFont(