用PyQt5开发一个简易的计算器

版权声明：本文纯属作者口胡，欢迎转载 https://blog.csdn.net/TQCAI666/article/details/80532034

• 效果图：
  

界面代码

• calc_interface.py

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

# Form implementation generated from reading ui file 'calc_interface.ui'
#
# Created by: PyQt5 UI code generator 5.8.2
#
# WARNING! All changes made in this file will be lost!

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.resize(647, 675)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")
        self.b_1 = QtWidgets.QPushButton(self.centralwidget)
        self.b_1.setGeometry(QtCore.QRect(10, 330, 71, 71))
        self.b_1.setObjectName("b_1")
        self.b_2 = QtWidgets.QPushButton(self.centralwidget)
        self.b_2.setGeometry(QtCore.QRect(80, 330, 71, 71))
        self.b_2.setObjectName("b_2")
        self.b_3 = QtWidgets.QPushButton(self.centralwidget)
        self.b_3.setGeometry(QtCore.QRect(150, 330, 71, 71))
        self.b_3.setObjectName("b_3")
        self.b_6 = QtWidgets.QPushButton(self.centralwidget)
        self.b_6.setGeometry(QtCore.QRect(150, 400, 71, 71))
        self.b_6.setObjectName("b_6")
        self.b_4 = QtWidgets.QPushButton(self.centralwidget)
        self.b_4.setGeometry(QtCore.QRect(10, 400, 71, 71))
        self.b_4.setObjectName("b_4")
        self.b_5 = QtWidgets.QPushButton(self.centralwidget)
        self.b_5.setGeometry(QtCore.QRect(80, 400, 71, 71))
        self.b_5.setObjectName("b_5")
        self.b_8 = QtWidgets.QPushButton(self.centralwidget)
        self.b_8.setGeometry(QtCore.QRect(80, 470, 71, 71))
        self.b_8.setObjectName("b_8")
        self.b_9 = QtWidgets.QPushButton(self.centralwidget)
        self.b_9.setGeometry(QtCore.QRect(150, 470, 71, 71))
        self.b_9.setObjectName("b_9")
        self.b_7 = QtWidgets.QPushButton(self.centralwidget)
        self.b_7.setGeometry(QtCore.QRect(10, 470, 71, 71))
        self.b_7.setObjectName("b_7")
        self.b_eq = QtWidgets.QPushButton(self.centralwidget)
        self.b_eq.setGeometry(QtCore.QRect(150, 540, 211, 71))
        self.b_eq.setObjectName("b_eq")
        self.b_mod = QtWidgets.QPushButton(self.centralwidget)
        self.b_mod.setGeometry(QtCore.QRect(220, 400, 71, 71))
        self.b_mod.setObjectName("b_mod")
        self.b_bra_l = QtWidgets.QPushButton(self.centralwidget)
        self.b_bra_l.setGeometry(QtCore.QRect(220, 330, 71, 71))
        self.b_bra_l.setObjectName("b_bra_l")
        self.b_div = QtWidgets.QPushButton(self.centralwidget)
        self.b_div.setGeometry(QtCore.QRect(220, 260, 71, 71))
        self.b_div.setObjectName("b_div")
        self.b_add = QtWidgets.QPushButton(self.centralwidget)
        self.b_add.setGeometry(QtCore.QRect(10, 260, 71, 71))
        self.b_add.setObjectName("b_add")
        self.b_sub = QtWidgets.QPushButton(self.centralwidget)
        self.b_sub.setGeometry(QtCore.QRect(80, 260, 71, 71))
        self.b_sub.setObjectName("b_sub")
        self.b_mul = QtWidgets.QPushButton(self.centralwidget)
        self.b_mul.setGeometry(QtCore.QRect(150, 260, 71, 71))
        self.b_mul.setObjectName("b_mul")
        self.b_pow = QtWidgets.QPushButton(self.centralwidget)
        self.b_pow.setGeometry(QtCore.QRect(290, 260, 71, 71))
        self.b_pow.setObjectName("b_pow")
        self.b_pai = QtWidgets.QPushButton(self.centralwidget)
        self.b_pai.setGeometry(QtCore.QRect(290, 400, 71, 71))
        self.b_pai.setObjectName("b_pai")
        self.b_bra_r = QtWidgets.QPushButton(self.centralwidget)
        self.b_bra_r.setGeometry(QtCore.QRect(290, 330, 71, 71))
        self.b_bra_r.setObjectName("b_bra_r")
        self.l_hist = QtWidgets.QListWidget(self.centralwidget)
        self.l_hist.setGeometry(QtCore.QRect(380, 10, 256, 601))
        self.l_hist.setObjectName("l_hist")
        self.e_view = QtWidgets.QTextEdit(self.centralwidget)
        self.e_view.setGeometry(QtCore.QRect(10, 10, 351, 231))
        font = QtGui.QFont()
        font.setFamily("Adobe Caslon Pro Bold")
        font.setPointSize(22)
        font.setBold(True)
        font.setWeight(75)
        self.e_view.setFont(font)
        self.e_view.setObjectName("e_view")
        self.b_0 = QtWidgets.QPushButton(self.centralwidget)
        self.b_0.setGeometry(QtCore.QRect(80, 540, 71, 71))
        self.b_0.setObjectName("b_0")
        self.b_pt = QtWidgets.QPushButton(self.centralwidget)
        self.b_pt.setGeometry(QtCore.QRect(10, 540, 71, 71))
        self.b_pt.setObjectName("b_pt")
        self.b_del = QtWidgets.QPushButton(self.centralwidget)
        self.b_del.setGeometry(QtCore.QRect(220, 470, 71, 71))
        self.b_del.setObjectName("b_del")
        self.b_clc = QtWidgets.QPushButton(self.centralwidget)
        self.b_clc.setGeometry(QtCore.QRect(290, 470, 71, 71))
        self.b_clc.setObjectName("b_clc")
        MainWindow.setCentralWidget(self.centralwidget)
        self.menubar = QtWidgets.QMenuBar(MainWindow)
        self.menubar.setGeometry(QtCore.QRect(0, 0, 647, 30))
        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.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "MainWindow"))
        self.b_1.setText(_translate("MainWindow", "1"))
        self.b_2.setText(_translate("MainWindow", "2"))
        self.b_3.setText(_translate("MainWindow", "3"))
        self.b_6.setText(_translate("MainWindow", "6"))
        self.b_4.setText(_translate("MainWindow", "4"))
        self.b_5.setText(_translate("MainWindow", "5"))
        self.b_8.setText(_translate("MainWindow", "8"))
        self.b_9.setText(_translate("MainWindow", "9"))
        self.b_7.setText(_translate("MainWindow", "7"))
        self.b_eq.setText(_translate("MainWindow", "="))
        self.b_mod.setText(_translate("MainWindow", "%"))
        self.b_bra_l.setText(_translate("MainWindow", "("))
        self.b_div.setText(_translate("MainWindow", "/"))
        self.b_add.setText(_translate("MainWindow", "+"))
        self.b_sub.setText(_translate("MainWindow", "-"))
        self.b_mul.setText(_translate("MainWindow", "*"))
        self.b_pow.setText(_translate("MainWindow", "^"))
        self.b_pai.setText(_translate("MainWindow", "π"))
        self.b_bra_r.setText(_translate("MainWindow", ")"))
        self.b_0.setText(_translate("MainWindow", "0"))
        self.b_pt.setText(_translate("MainWindow", "."))
        self.b_del.setText(_translate("MainWindow", "删除"))
        self.b_clc.setText(_translate("MainWindow", "清空"))

主逻辑代码

• calc_main.py

from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
from calc_interface import Ui_MainWindow
import os,sys

global e_view

pluginsPath='PyQt5/Qt/plugins'
if os.path.exists(pluginsPath):#指定插件路径。源码运行时不会生效，打包后运行检测到路径，加载插件
    QApplication.addLibraryPath(pluginsPath)

class MyMainWindow(QMainWindow, Ui_MainWindow):

    def forge_link(self):
        self.b_0.clicked.connect(self.button_event(0))
        self.b_1.clicked.connect(self.button_event(1))
        self.b_2.clicked.connect(self.button_event(2))
        self.b_3.clicked.connect(self.button_event(3))
        self.b_4.clicked.connect(self.button_event(4))
        self.b_5.clicked.connect(self.button_event(5))
        self.b_6.clicked.connect(self.button_event(6))
        self.b_7.clicked.connect(self.button_event(7))
        self.b_8.clicked.connect(self.button_event(8))
        self.b_9.clicked.connect(self.button_event(9))
        self.b_add.clicked.connect(self.button_event('+'))
        self.b_sub.clicked.connect(self.button_event('-'))
        self.b_mul.clicked.connect(self.button_event('*'))
        self.b_div.clicked.connect(self.button_event('/'))
        self.b_pow.clicked.connect(self.button_event('**'))
        self.b_bra_l.clicked.connect(self.button_event('('))
        self.b_bra_r.clicked.connect(self.button_event(')'))
        self.b_mod.clicked.connect(self.button_event('%'))
        self.b_pai.clicked.connect(self.button_event('3.1415926'))
        self.b_pt.clicked.connect(self.button_event('.'))
        self.b_del.clicked.connect(self.delete_event)
        self.b_clc.clicked.connect(self.clear_event)
        self.b_eq.clicked.connect(self.calc_complish)

    def __init__(self, parent=None):
        super(MyMainWindow, self).__init__(parent)
        self.setupUi(self)
        self.forge_link()   #连接槽函数

    def button_event(self,arg):
        # print(dir(self.e_view))
        global e_view
        e_view=self.e_view
        def fun():      #返回一个自定义的槽函数
            global e_view
            txt = e_view.toPlainText()
            e_view.setText(txt + str(arg))
        return fun

    def calc_complish(self):
        txt=self.e_view.toPlainText()
        ans=''
        try:
            ans=str(eval(txt))
        except BaseException:
            ans='MathError'
        # print(ans)
        self.clear_event()
        self.e_view.setText(ans)
        self.l_hist.addItem(txt+'='+ans)

    def clear_event(self):
        self.e_view.setText('')

    def delete_event(self):
        txt = self.e_view.toPlainText()
        txt=txt[:len(txt)-1]
        self.e_view.setText(txt)

if __name__ == '__main__':
    app=QApplication(sys.argv)
    myWin=MyMainWindow()
    myWin.show()
    sys.exit(app.exec())