python+ pyqt5 实现最简单的计算器

问题描述：
用python + pyqt5 实现最简单的计算器
【 1： 只能进行 2 个数字的运算；2： 除法的第二位数不能是0 】
运行效果：

问题解决：
全部代码如下： 【 只需要进行打包即可， pyinstaller -F ./calculator.py 】

import sys
import re
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import QMainWindow

class Calculator_Window(QMainWindow):
    def setupUi(self, CalculatorWindow):
        CalculatorWindow.setObjectName(\"Calculator\")
        CalculatorWindow.resize(500, 800)

        # 1: 先打一条显示器
        self.showEdit = QtWidgets.QLineEdit(CalculatorWindow)
        self.showEdit.setGeometry(QtCore.QRect(20, 40, 300, 60))

        # 2: 打一个 九宫格 ，并把相应的数字打 [ 先打一个主框，左九宫格，右+-*/， 然后用窗口添加该主框 ]
        self.containerWidget = QtWidgets.QWidget(CalculatorWindow)
        self.containerWidget.setObjectName(\"containerWidget\")

        # 3: 1 - 9 数字的布局
        self.gridLayoutWidget = QtWidgets.QWidget(self.containerWidget)
        self.gridLayoutWidget.setGeometry(QtCore.QRect(20, 100, 300, 500))
        self.gridLayoutWidget.setObjectName(\"gridLayoutWidget\")
        self.gridLayout = QtWidgets.QGridLayout(self.gridLayoutWidget)
        self.gridLayout.setContentsMargins(0, 0, 0, 0) # 这里的 setContentsMargins 是左, 上, 右, 下
        self.gridLayout.setObjectName(\"gridLayout\")
        self.btn_nmb_1 = QtWidgets.QPushButton(self.gridLayoutWidget)
        self.btn_nmb_1.setObjectName(\"btn_nmb_1\")
        self.gridLayout.addWidget(self.btn_nmb_1, 0, 0, 1, 1)
        self.btn_nmb_2 = QtWidgets.QPushButton(self.gridLayoutWidget)
        self.btn_nmb_2.setObjectName(\"btn_nmb_2\")
        self.gridLayout.addWidget(self.btn_nmb_2, 0, 1, 1, 1)
        self.btn_nmb_3 = QtWidgets.QPushButton(self.gridLayoutWidget)
        self.btn_nmb_3.setObjectName(\"btn_nmb_3\")
        self.gridLayout.addWidget(self.btn_nmb_3, 0, 2, 1, 1)
        self.btn_nmb_4 = QtWidgets.QPushButton(self.gridLayoutWidget)
        self.btn_nmb_4.setObjectName(\"btn_nmb_4\")
        self.gridLayout.addWidget(self.btn_nmb_4, 1, 0, 1, 1)
        self.btn_nmb_5 = QtWidgets.QPushButton(self.gridLayoutWidget)
        self.btn_nmb_5.setObjectName(\"btn_nmb_5\")
        self.gridLayout.addWidget(self.btn_nmb_5, 1, 1, 1, 1)
        self.btn_nmb_6 = QtWidgets.QPushButton(self.gridLayoutWidget)
        self.btn_nmb_6.setObjectName(\"btn_nmb_6\")
        self.gridLayout.addWidget(self.btn_nmb_6, 1, 2, 1, 1)
        self.btn_nmb_7 = QtWidgets.QPushButton(self.gridLayoutWidget)
        self.btn_nmb_7.setObjectName(\"btn_nmb_7\")
        self.gridLayout.addWidget(self.btn_nmb_7, 2, 0, 1, 1)
        self.btn_nmb_8 = QtWidgets.QPushButton(self.gridLayoutWidget)
        self.btn_nmb_8.setObjectName(\"btn_nmb_8\")
        self.gridLayout.addWidget(self.btn_nmb_8, 2, 1, 1, 1)
        self.btn_nmb_9 = QtWidgets.QPushButton(self.gridLayoutWidget)
        self.btn_nmb_9.setObjectName(\"btn_nmb_9\")
        self.gridLayout.addWidget(self.btn_nmb_9, 2, 2, 1, 1)

        # + - * / 的垂直布局
        self.verticalLayoutWidget = QtWidgets.QWidget(self.containerWidget)
        self.verticalLayoutWidget.setGeometry(QtCore.QRect(340, 100, 70, 450))
        self.verticalLayoutWidget.setObjectName(\"verticalLayoutWidget\")
        self.verticalLayout = QtWidgets.QVBoxLayout(self.verticalLayoutWidget)
        self.verticalLayout.setContentsMargins(0, 0, 0, 0)
        self.verticalLayout.setObjectName(\"verticalLayout\")

        self.btn_add = QtWidgets.QPushButton(self.verticalLayoutWidget)
        self.btn_add.setObjectName(\"btn_add\")
        self.verticalLayout.addWidget(self.btn_add)
        self.btn_minus = QtWidgets.QPushButton(self.verticalLayoutWidget)
        self.btn_minus.setObjectName(\"btn_minus\")
        self.verticalLayout.addWidget(self.btn_minus)
        self.btn_multiply = QtWidgets.QPushButton(self.verticalLayoutWidget)
        self.btn_multiply.setObjectName(\"btn_multiply\")
        self.verticalLayout.addWidget(self.btn_multiply)
        self.btn_divide = QtWidgets.QPushButton(self.verticalLayoutWidget)
        self.btn_divide.setObjectName(\"btn_divide\")
        self.verticalLayout.addWidget(self.btn_divide)
        self.btn_equal = QtWidgets.QPushButton(self.verticalLayoutWidget)
        self.btn_equal.setObjectName(\"btn_equal\")
        self.verticalLayout.addWidget(self.btn_equal)

        CalculatorWindow.setCentralWidget(self.containerWidget) # 窗口添加该主框

        self.retranslateUi(CalculatorWindow) # 设置文字的的函数
        QtCore.QMetaObject.connectSlotsByName(CalculatorWindow) # 连接到指定的槽

    def retranslateUi(self, CalculatorWindow): 
        _translate = QtCore.QCoreApplication.translate
        CalculatorWindow.setWindowTitle(\"计算器\")

        self.showEdit.setText(_translate(\"CalculatorWindow\", \" 1 + 1 = 2\"))  # 显示框

        # 1 - 9 按钮上的数字填充
        self.btn_nmb_1.setText(_translate(\"CalculatorWindow\", \"1\"))
        self.btn_nmb_2.setText(_translate(\"CalculatorWindow\", \"2\"))
        self.btn_nmb_3.setText(_translate(\"CalculatorWindow\", \"3\"))
        self.btn_nmb_4.setText(_translate(\"CalculatorWindow\", \"4\"))
        self.btn_nmb_5.setText(_translate(\"CalculatorWindow\", \"5\"))
        self.btn_nmb_6.setText(_translate(\"CalculatorWindow\", \"6\"))
        self.btn_nmb_7.setText(_translate(\"CalculatorWindow\", \"7\"))
        self.btn_nmb_8.setText(_translate(\"CalculatorWindow\", \"8\"))
        self.btn_nmb_9.setText(_translate(\"CalculatorWindow\", \"9\"))

        # + - * / 的字符填充
        self.btn_add.setText(_translate(\"CalculatorWindow\", \"+\"))
        self.btn_minus.setText(_translate(\"CalculatorWindow\", \"-\"))
        self.btn_multiply.setText(_translate(\"CalculatorWindow\", \"*\"))
        self.btn_divide.setText(_translate(\"CalculatorWindow\", \"/\"))
        self.btn_equal.setText(_translate(\"CalculatorWindow\", \"=\"))

        # 给每个按钮的点击事件，统一处理
        self.btn_nmb_1.clicked.connect(self.btnClick)
        self.btn_nmb_2.clicked.connect(self.btnClick)
        self.btn_nmb_3.clicked.connect(self.btnClick)
        self.btn_nmb_4.clicked.connect(self.btnClick)
        self.btn_nmb_5.clicked.connect(self.btnClick)
        self.btn_nmb_6.clicked.connect(self.btnClick)
        self.btn_nmb_7.clicked.connect(self.btnClick)
        self.btn_nmb_8.clicked.connect(self.btnClick)
        self.btn_nmb_9.clicked.connect(self.btnClick)
        self.btn_add.clicked.connect(self.btnClick)
        self.btn_minus.clicked.connect(self.btnClick)
        self.btn_multiply.clicked.connect(self.btnClick)
        self.btn_divide.clicked.connect(self.btnClick)
        self.btn_equal.clicked.connect(self.btnClick)

    showString = \' \'
    nmb1 = 0 # 第一个数字
    nmbOprerator = \'\'
    nmb2 = 0 # 第二个数字
    nmb3 = 0 # 第三个数字
    def btnClick(self): # 统一处理按钮事件； 思路：数字 + 符号 字符串  = 这种格式
        sender = self.sender()
        senderText = sender.text()
        self.valueNmb(str(senderText))

    def valueNmb(self, senderText): # 对按下的按钮进行计算
        if (senderText == \"+\" or senderText == \"-\" or senderText == \"*\" or senderText == \"/\"):
            self.showString += \" \" + senderText + \" \"
            self.nmb1 = re.sub(r\'\\D\', \"\", self.showString) # 取符号前面的数字为 nmb1
            self.nmbOprerator = senderText
            self.showRes(str(self.nmb1) + \" \" + self.nmbOprerator + \" \")
        elif (senderText == \"=\"):
            self.showString += senderText
            nmb2Index = self.showString.find(self.nmbOprerator) + 1 # +1 是因为把 + - * / 的符号去掉
            self.nmb2 = self.showString[nmb2Index: -1]
            self.nmb3 = self.switchCal(int(self.nmb1), str(self.nmbOprerator), int(self.nmb2))
            self.showRes(str(self.nmb1) + \" \" + self.nmbOprerator + \" \" + str(self.nmb2) + \" = \" + str(self.nmb3))
        else:
            self.showString += senderText
            self.showRes(self.showString)
            

    def switchCal(self, nmb1, nmbOprerator, nmb2): # nmb3 进行计算
        nmb1 = int(nmb1)
        nmb2 = int(nmb2)
        if (nmbOprerator == \"+\"):
            return nmb1 + nmb2
        elif (nmbOprerator == \"-\"):
            return nmb1 - nmb2
        elif (nmbOprerator == \"*\"):
            return nmb1 * nmb2
        elif (nmbOprerator == \"/\"):
            return nmb1 / nmb2
        else:
            return 0

    def showRes(self, string): # 按钮改变显示的内容
        self.showEdit.setText(string)

if __name__ == \"__main__\":
    app = QtWidgets.QApplication(sys.argv)
    widget = QtWidgets.QMainWindow()
    window = Calculator_Window()
    window.setupUi(widget)
    widget.show()
    sys.exit(app.exec())

来源：https://blog.csdn.net/qq_38192709/article/details/123232530
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