PyQt5实现简易计算器

# -*- 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, QtWidgetsclass 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"))

from PyQt5.QtCore import *from PyQt5.QtGui import *from PyQt5.QtWidgets import *from calc_interface import Ui_MainWindowimport os,sysglobal e_viewpluginsPath='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())