Demo 簡單計算器
用最簡單，也是最笨的方法，實現了簡單計算器的功能，包括：加、減、乘、除、開根、求平方、百分數等運算。
代碼
計算器控件代碼（.ui轉.py）：main.py
# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'I:\1實驗室\其他\QTtest\calculator\main.ui'
#
# Created by: PyQt5 UI code generator 5.10.1
#
# WARNING! All changes made in this file will be lost!
from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_Form(object):
def setupUi(self, Form):
Form.setObjectName("Form")
Form.resize(333, 315)
self.textEdit_show = QtWidgets.QTextEdit(Form)
self.textEdit_show.setGeometry(QtCore.QRect(10, 10, 311, 41))
self.textEdit_show.setObjectName("textEdit_show")
self.textEdit_result = QtWidgets.QTextEdit(Form)
self.textEdit_result.setGeometry(QtCore.QRect(10, 50, 311, 41))
self.textEdit_result.setObjectName("textEdit_result")
self.pushButton_del = QtWidgets.QPushButton(Form)
self.pushButton_del.setGeometry(QtCore.QRect(10, 110, 75, 31))
self.pushButton_del.setObjectName("pushButton_del")
self.pushButton_square = QtWidgets.QPushButton(Form)
self.pushButton_square.setGeometry(QtCore.QRect(90, 110, 75, 31))
self.pushButton_square.setObjectName("pushButton_square")
self.pushButton_root = QtWidgets.QPushButton(Form)
self.pushButton_root.setGeometry(QtCore.QRect(170, 110, 75, 31))
self.pushButton_root.setObjectName("pushButton_root")
self.pushButton_div = QtWidgets.QPushButton(Form)
self.pushButton_div.setGeometry(QtCore.QRect(250, 110, 75, 31))
self.pushButton_div.setObjectName("pushButton_div")
self.pushButton_7 = QtWidgets.QPushButton(Form)
self.pushButton_7.setGeometry(QtCore.QRect(10, 150, 75, 31))
self.pushButton_7.setObjectName("pushButton_7")
self.pushButton_8 = QtWidgets.QPushButton(Form)
self.pushButton_8.setGeometry(QtCore.QRect(90, 150, 75, 31))
self.pushButton_8.setObjectName("pushButton_8")
self.pushButton_mul = QtWidgets.QPushButton(Form)
self.pushButton_mul.setGeometry(QtCore.QRect(250, 150, 75, 31))
self.pushButton_mul.setObjectName("pushButton_mul")
self.pushButton_9 = QtWidgets.QPushButton(Form)
self.pushButton_9.setGeometry(QtCore.QRect(170, 150, 75, 31))
self.pushButton_9.setObjectName("pushButton_9")
self.pushButton_4 = QtWidgets.QPushButton(Form)
self.pushButton_4.setGeometry(QtCore.QRect(10, 190, 75, 31))
self.pushButton_4.setObjectName("pushButton_4")
self.pushButton_5 = QtWidgets.QPushButton(Form)
self.pushButton_5.setGeometry(QtCore.QRect(90, 190, 75, 31))
self.pushButton_5.setObjectName("pushButton_5")
self.pushButton_plus = QtWidgets.QPushButton(Form)
self.pushButton_plus.setGeometry(QtCore.QRect(250, 190, 75, 31))
self.pushButton_plus.setObjectName("pushButton_plus")
self.pushButton_6 = QtWidgets.QPushButton(Form)
self.pushButton_6.setGeometry(QtCore.QRect(170, 190, 75, 31))
self.pushButton_6.setObjectName("pushButton_6")
self.pushButton_1 = QtWidgets.QPushButton(Form)
self.pushButton_1.setGeometry(QtCore.QRect(10, 230, 75, 31))
self.pushButton_1.setObjectName("pushButton_1")
self.pushButton_2 = QtWidgets.QPushButton(Form)
self.pushButton_2.setGeometry(QtCore.QRect(90, 230, 75, 31))
self.pushButton_2.setObjectName("pushButton_2")
self.pushButton_sub = QtWidgets.QPushButton(Form)
self.pushButton_sub.setGeometry(QtCore.QRect(250, 230, 75, 31))
self.pushButton_sub.setObjectName("pushButton_sub")
self.pushButton_3 = QtWidgets.QPushButton(Form)
self.pushButton_3.setGeometry(QtCore.QRect(170, 230, 75, 31))
self.pushButton_3.setObjectName("pushButton_3")
self.pushButton_percent = QtWidgets.QPushButton(Form)
self.pushButton_percent.setGeometry(QtCore.QRect(10, 270, 75, 31))
self.pushButton_percent.setObjectName("pushButton_percent")
self.pushButton_0 = QtWidgets.QPushButton(Form)
self.pushButton_0.setGeometry(QtCore.QRect(90, 270, 75, 31))
self.pushButton_0.setObjectName("pushButton_0")
self.pushButton_equal = QtWidgets.QPushButton(Form)
self.pushButton_equal.setGeometry(QtCore.QRect(250, 270, 75, 31))
self.pushButton_equal.setObjectName("pushButton_equal")
self.pushButton_dot = QtWidgets.QPushButton(Form)
self.pushButton_dot.setGeometry(QtCore.QRect(170, 270, 75, 31))
self.pushButton_dot.setObjectName("pushButton_dot")
self.retranslateUi(Form)
QtCore.QMetaObject.connectSlotsByName(Form)
def retranslateUi(self, Form):
_translate = QtCore.QCoreApplication.translate
Form.setWindowTitle(_translate("Form", "Form"))
self.pushButton_del.setText(_translate("Form", "Del"))
self.pushButton_square.setText(_translate("Form", "^2"))
self.pushButton_root.setText(_translate("Form", "^1/2"))
self.pushButton_div.setText(_translate("Form", "/"))
self.pushButton_7.setText(_translate("Form", "7"))
self.pushButton_8.setText(_translate("Form", "8"))
self.pushButton_mul.setText(_translate("Form", "*"))
self.pushButton_9.setText(_translate("Form", "9"))
self.pushButton_4.setText(_translate("Form", "4"))
self.pushButton_5.setText(_translate("Form", "5"))
self.pushButton_plus.setText(_translate("Form", "+"))
self.pushButton_6.setText(_translate("Form", "6"))
self.pushButton_1.setText(_translate("Form", "1"))
self.pushButton_2.setText(_translate("Form", "2"))
self.pushButton_sub.setText(_translate("Form", "-"))
self.pushButton_3.setText(_translate("Form", "3"))
self.pushButton_percent.setText(_translate("Form", "%"))
self.pushButton_0.setText(_translate("Form", "0"))
self.pushButton_equal.setText(_translate("Form", "="))
self.pushButton_dot.setText(_translate("Form", "."))
功能實現代碼：calculator.py
# -*- coding: utf-8 -*-
"""
Created on Tue Feb 25 03:55:09 2020
@author: Administrator
"""
from PyQt5 import QtWidgets
from PyQt5.QtWidgets import QMessageBox
from PyQt5.QtCore import QTimer, QDateTime, QBasicTimer
from PyQt5.QtGui import QIcon, QTextDocument
from PyQt5.QtPrintSupport import QPrinter, QPrintDialog,QPrintPreviewDialog
from main import Ui_Form
class mywindow(QtWidgets.QWidget, Ui_Form):
def __init__ (self):
super(mywindow, self).__init__()
self.setupUi(self)
#數字鍵
self.pushButton_0.clicked.connect(self.printNumber_0)
self.pushButton_1.clicked.connect(self.printNumber_1)
self.pushButton_2.clicked.connect(self.printNumber_2)
self.pushButton_3.clicked.connect(self.printNumber_3)
self.pushButton_4.clicked.connect(self.printNumber_4)
self.pushButton_5.clicked.connect(self.printNumber_5)
self.pushButton_6.clicked.connect(self.printNumber_6)
self.pushButton_7.clicked.connect(self.printNumber_7)
self.pushButton_8.clicked.connect(self.printNumber_8)
self.pushButton_9.clicked.connect(self.printNumber_9)
self.pushButton_plus.clicked.connect(self.printNumber_plus)
self.pushButton_sub.clicked.connect(self.printNumber_sub)
self.pushButton_mul.clicked.connect(self.printNumber_mul)
self.pushButton_div.clicked.connect(self.printNumber_div)
self.pushButton_dot.clicked.connect(self.printNumber_dot)
self.pushButton_percent.clicked.connect(self.printNumber_percent)
self.pushButton_square.clicked.connect(self.printNumber_square)
self.pushButton_root.clicked.connect(self.printNumber_root)
self.pushButton_equal.clicked.connect(self.calculate)
self.pushButton_del.clicked.connect(self.deleteContent)
#直接顯示
def printNumber_0(self):
self.isEqual()
self.textEdit_show.insertPlainText("0")
def printNumber_1(self):
self.isEqual()
self.textEdit_show.insertPlainText("1")
def printNumber_2(self):
self.isEqual()
self.textEdit_show.insertPlainText("2")
def printNumber_3(self):
self.isEqual()
self.textEdit_show.insertPlainText("3")
def printNumber_4(self):
self.isEqual()
self.textEdit_show.insertPlainText("4")
def printNumber_5(self):
self.isEqual()
self.textEdit_show.insertPlainText("5")
def printNumber_6(self):
self.isEqual()
self.textEdit_show.insertPlainText("6")
def printNumber_7(self):
self.isEqual()
self.textEdit_show.insertPlainText("7")
def printNumber_8(self):
self.isEqual()
self.textEdit_show.insertPlainText("8")
def printNumber_9(self):
self.isEqual()
self.textEdit_show.insertPlainText("9")
def printNumber_plus(self):
self.isEqual()
self.textEdit_show.insertPlainText("+")
def printNumber_sub(self):
self.isEqual()
self.textEdit_show.insertPlainText("-")
def printNumber_mul(self):
self.isEqual()
self.textEdit_show.insertPlainText("*")
def printNumber_div(self):
self.isEqual()
self.textEdit_show.insertPlainText("/")
def printNumber_dot(self):
self.isEqual()
self.textEdit_show.insertPlainText(".")
def printNumber_percent(self):
self.isEqual()
self.textEdit_show.insertPlainText("%")
# def printNumber_equal(self):
# self.textEdit_show.insertPlainText("=")
def printNumber_square(self):
self.isEqual()
self.textEdit_show.insertPlainText("^2")
def printNumber_root(self):
self.isEqual()
self.textEdit_show.insertPlainText("^(1/2)")
def isEqual(self):
content = self.textEdit_show.toPlainText()
tag = content.find('=')
# tag = self.textEdit_show.find('=')
print(self.textEdit_show.toPlainText())
print("tag: "+str(tag))
if tag != -1:
self.textEdit_show.setText("")
def deleteContent(self):
self.textEdit_show.setText("")
self.textEdit_result.setText("")
def calculate(self):
self.textEdit_show.insertPlainText("=")
content = self.textEdit_show.toPlainText()
print(content)
tmp = ""
sign = list()
num_list = list()
for i in range(len(content)):
# 數字
if content[i] not in "+-*/()%^":
# tmp.append(content[i])
tmp = tmp + content[i]
# 字符
elif tmp != '':
num_list.append(float(tmp))
tmp = ""
sign.append(content[i])
elif tmp == '':
sign.append(content[i])
aa = tmp.split('=')
if aa[0] != '':
num_list.append(float(aa[0]))
print(num_list)
print(sign)
#運算
# % 平方 開方
i = 0
while i < len(sign):
#百分數
if sign[i] == '%' :
num_list[i] = float(num_list[i]/100)
del(sign[i])
#平方
elif sign[i] == '^' and num_list[i+1] == 2:
num_list[i] = num_list[i] * num_list[i]
del(sign[i])
del(num_list[i+1])
#平方根
elif sign[i] == '^' and sign[i+1] == '(':
import math
num_list[i] = float(math.sqrt(num_list[i]))
del(num_list[i+2])
del(num_list[i+1])
del(sign[i+3])
del(sign[i+2])
del(sign[i+1])
del(sign[i])
else:
i = i + 1
# + - * /
result = num_list[0]
for i in range(len(sign)):
if sign[i] == '*':
result = result * num_list[i+1]
elif sign[i] == '/' and num_list[i+1] != 0:
result = result / num_list[i+1]
elif sign[i] == '+':
result = result + num_list[i+1]
elif sign[i] == '-':
result = result - num_list[i+1]
else:
print("Calculate wrong!")
self.textEdit_result.setText("Wrong!")
return
self.textEdit_result.setText(str(result))
if __name__=="__main__":
import sys
# 添加if判斷語句可以解決spyder內核重啓的問題
if not QtWidgets.QApplication.instance():
app = QtWidgets.QApplication(sys.argv)
else:
app = QtWidgets.QApplication.instance()
# app=QtWidgets.QApplication(sys.argv)
ui = mywindow()
ui.show()
# input("input something")
sys.exit(app.exec_())
運行界面
注意事項
此代碼在測試運行中暫時未發現問題。
運算符操作中注意一元運算符與二元運算符的區別，及二者混合運算的問題。
存在的問題
-
界面美化待完善；
-
運算符優先級——“（）”，待完善；
-
其他複雜運算的功能，待完善。