With the background of blog, we used Pyqt5 to implement a simple calculator. I think it's important to use the eval function of py

When did I write the player or implement the java directory tree or xml parser I want to write recently

The idea is to click the button and add it to string to form algorithm expression, and then rely on python's powerful computing function.

There will be new versions later

github address

from PyQt5.QtWidgets import QLabel, QApplication, QDialog, QGridLayout, QHBoxLayout, QPushButton, QFormLayout, \
    QWidget, \
    QLineEdit
import sys
from PyQt5.QtCore import Qt
from PyQt5.QtGui import QIcon
import test

class calculator_frame(QDialog):
    def __init__(self):
        super().__init__()
        self.shower = QLineEdit()
        self.label = QLabel()
        self.init()
        self.tmp_string_num = ""
        self.tmp_num = 0
        self.sum_num = ""
        self.num = 0

    def init(self):

        self.setWindowTitle("personal computer ")
        self.setWindowIcon(QIcon(':/calculator.ico'))
        self.label.setStyleSheet('font-size:20px;color:rgb(180,180,180,255);')
        self.shower.setStyleSheet('font-size:20px;color:rgb(180,180,180,255);')
        self.shower.setEnabled(False)
        hbox = QHBoxLayout()
        form_widget = QWidget()
        grid_widget = QWidget()
        form_layout = QFormLayout()
        form_layout.addRow("memory:", self.shower)
        form_layout.addRow("result=", self.label)
        form_widget.setLayout(form_layout)
        # self.setFixedSize(300,200)

        grid_layout = QGridLayout()
        one = QPushButton("1")
        two = QPushButton("2")
        three = QPushButton("3")
        four = QPushButton("4")
        five = QPushButton("5")
        six = QPushButton("6")
        seven = QPushButton("7")
        eight = QPushButton("8")
        nine = QPushButton("9")
        zero = QPushButton("0")
        point = QPushButton(".")
        equal = QPushButton("=")
        add = QPushButton("+")
        sub = QPushButton("-")
        mult = QPushButton("*")
        div = QPushButton("/")

        one.clicked.connect(self.clicker)
        two.clicked.connect(self.clicker)
        three.clicked.connect(self.clicker)
        four.clicked.connect(self.clicker)
        five.clicked.connect(self.clicker)
        six.clicked.connect(self.clicker)
        seven.clicked.connect(self.clicker)
        eight.clicked.connect(self.clicker)
        nine.clicked.connect(self.clicker)
        zero.clicked.connect(self.clicker)
        add.clicked.connect(self.clicker)
        sub.clicked.connect(self.clicker)
        mult.clicked.connect(self.clicker)
        div.clicked.connect(self.clicker)
        equal.clicked.connect(self.clicker)
        point.clicked.connect(self.clicker)
        one.setStyleSheet('font-size:32px;color:rgb(0,0,0,255);')
        two.setStyleSheet('font-size:32px;color:rgb(0,0,0,255);')
        three.setStyleSheet('font-size:32px;color:rgb(0,0,0,255);')
        four.setStyleSheet('font-size:32px;color:rgb(0,0,0,255);')
        five.setStyleSheet('font-size:32px;color:rgb(0,0,0,255);')
        six.setStyleSheet('font-size:32px;color:rgb(0,0,0,255);')
        seven.setStyleSheet('font-size:32px;color:rgb(0,0,0,255);')
        eight.setStyleSheet('font-size:32px;color:rgb(0,0,0,255);')
        nine.setStyleSheet('font-size:32px;color:rgb(0,0,0,255);')
        zero.setStyleSheet('font-size:32px;color:rgb(0,0,0,255);')
        point.setStyleSheet('font-size:32px;color:rgb(0,0,0,255);')
        equal.setStyleSheet('font-size:32px;color:rgb(0,0,0,255);')
        add.setStyleSheet('font-size:28px;color:rgb(0,0,0,255);')
        sub.setStyleSheet('font-size:28px;color:rgb(0,0,0,255);')
        mult.setStyleSheet('font-size:28px;color:rgb(0,0,0,255);')
        div.setStyleSheet('font-size:28px;color:rgb(0,0,0,255);')

        grid_layout.addWidget(add, 2, 4)
        grid_layout.addWidget(div, 1, 4)
        grid_layout.addWidget(mult, 0, 4)
        grid_layout.addWidget(sub, 3, 4)
        grid_layout.addWidget(zero, 3, 2)
        grid_layout.addWidget(point, 3, 1)
        grid_layout.addWidget(equal, 3, 3)
        grid_layout.addWidget(one, 2, 1)
        grid_layout.addWidget(two, 2, 2)
        grid_layout.addWidget(three, 2, 3)
        grid_layout.addWidget(four, 1, 1)
        grid_layout.addWidget(five, 1, 2)
        grid_layout.addWidget(six, 1, 3)
        grid_layout.addWidget(seven, 0, 1)
        grid_layout.addWidget(eight, 0, 2)
        grid_layout.addWidget(nine, 0, 3)
        grid_widget.setLayout(grid_layout)
        hbox.addWidget(form_widget, 0, Qt.AlignLeft)
        hbox.addWidget(grid_widget, 0, Qt.AlignRight)
        self.setLayout(hbox)

    def clicker(self):
        num_or_opt = self.sender().text()
        if num_or_opt.isdigit():
            self.tmp_string_num += str(num_or_opt)
            self.tmp_num = int(self.tmp_string_num)
            self.shower.setText(self.tmp_string_num)
            self.sum_num += self.tmp_string_num
            print(self.sum_num)
            self.label.setText(self.sum_num)
            self.tmp_string_num=""
            self.tmp_num = 0
        else:
            if not num_or_opt == "=":
                self.tmp_string_num += num_or_opt
                self.sum_num += num_or_opt
                self.shower.setText(self.tmp_string_num)
                self.tmp_string_num = ""
                self.tmp_num = 0
            else:
                self.label.setText(str(eval(self.sum_num)))


if __name__ == '__main__':

    app = QApplication(sys.argv)
    mainFrame = calculator_frame()
    mainFrame.show()
    sys.exit(app.exec_())

At the beginning, I didn't consider the derivation [(x,y) for x,y in xx] I regret it, but I have written it all, it's OK to use it, eval is the key, otherwise I can't break the dead end