Membuat Aplikasi Kalkulator Dengan Python Menggunakan Library PySide

Kalau pada postingan sebelumnya saya membagikan tutorial tentang cara membuat aplikasi kalkulator dengan java menggunakan netbeans IDE. Kali ini saya akan kembali membagikan source code untuk membuat aplikasi kalkulator lagi, namun yang berbeda disini menggunakan bahasa pemrograman python dengan memanfaatkan library pyside.

Bagi temen-temen yang sudah membaca postingan saya tentang cara membuat aplikasi kalkulator dengan java menggunakan netbeans IDE, pastinya sudah tau kan kalau kita bisa membuat desain kalkulatornya dengan cara drag and drop dari aset-aset yang telah disediakan oleh netbeans IDE.

Nah, jauh berbeda dengan java yang bisa drag and drop untuk membuat desain aplikasinya. Kali ini dengan menggunakan python kita akan membuat semuanya dengan coding alias full coding, baik itu desain maupun fungsional aplikasinya hehehe... lebih greget kan?

Namun sebenarnya kita juga bisa membuat desain aplikasi dengan cara drag and drop di python, yaitu dengan menggunakan aplikasi QtDesigner... Tapi tidak untuk kali ini, mungkin next post saya bagikan contoh aplikasi yang didesain menggunakan QtDesigner. Di tunggu ya... hehehe

Berikut source code untuk membuat aplikasi kalkulator dengan python menggunakan library pyside.

import math
from PySide import QtCore, QtGui

class Button(QtGui.QToolButton):
    def __init__(self, text, parent=None):
        super(Button, self).__init__(parent)

        self.setSizePolicy(QtGui.QSizePolicy.Expanding,
                QtGui.QSizePolicy.Preferred)
        self.setText(text)

    def sizeHint(self):
        size = super(Button, self).sizeHint()
        size.setHeight(size.height() + 20)
        size.setWidth(max(size.width(), size.height()))
        return size


class Calculator(QtGui.QDialog):
    NumDigitButtons = 10

    def __init__(self, parent=None):
        super(Calculator, self).__init__(parent)

        self.pendingAdditiveOperator = ''
        self.pendingMultiplicativeOperator = ''

        self.sumInMemory = 0.0
        self.sumSoFar = 0.0
        self.factorSoFar = 0.0
        self.waitingForOperand = True

        self.display = QtGui.QLineEdit('0')
        self.display.setReadOnly(True)
        self.display.setAlignment(QtCore.Qt.AlignRight)
        self.display.setMaxLength(15)

        font = self.display.font()
        font.setPointSize(font.pointSize() + 8)
        self.display.setFont(font)

        self.digitButtons = []

        for i in range(Calculator.NumDigitButtons):
            self.digitButtons.append(self.createButton(str(i),
                    self.digitClicked))

        self.pointButton = self.createButton(".", self.pointClicked)
        self.changeSignButton = self.createButton("\261",
                self.changeSignClicked)

        self.backspaceButton = self.createButton("Backspace",
                self.backspaceClicked)
        self.clearButton = self.createButton("Clear", self.clear)
        self.clearAllButton = self.createButton("Clear All", self.clearAll)

        self.clearMemoryButton = self.createButton("MC", self.clearMemory)
        self.readMemoryButton = self.createButton("MR", self.readMemory)
        self.setMemoryButton = self.createButton("MS", self.setMemory)
        self.addToMemoryButton = self.createButton("M+", self.addToMemory)

        self.divisionButton = self.createButton("\367",
                self.multiplicativeOperatorClicked)
        self.timesButton = self.createButton("\327",
                self.multiplicativeOperatorClicked)
        self.minusButton = self.createButton("-", self.additiveOperatorClicked)
        self.plusButton = self.createButton("+", self.additiveOperatorClicked)

        self.squareRootButton = self.createButton("Sqrt",
                self.unaryOperatorClicked)
        self.powerButton = self.createButton("x\262",
                self.unaryOperatorClicked)
        self.reciprocalButton = self.createButton("1/x",
                self.unaryOperatorClicked)
        self.equalButton = self.createButton("=", self.equalClicked)

        mainLayout = QtGui.QGridLayout()
        mainLayout.setSizeConstraint(QtGui.QLayout.SetFixedSize)

        mainLayout.addWidget(self.display, 0, 0, 1, 6)
        mainLayout.addWidget(self.backspaceButton, 1, 0, 1, 2)
        mainLayout.addWidget(self.clearButton, 1, 2, 1, 2)
        mainLayout.addWidget(self.clearAllButton, 1, 4, 1, 2)

        mainLayout.addWidget(self.clearMemoryButton, 2, 0)
        mainLayout.addWidget(self.readMemoryButton, 3, 0)
        mainLayout.addWidget(self.setMemoryButton, 4, 0)
        mainLayout.addWidget(self.addToMemoryButton, 5, 0)

        for i in range(1, Calculator.NumDigitButtons):
            row = ((9 - i) / 3) + 2
            column = ((i - 1) % 3) + 1
            mainLayout.addWidget(self.digitButtons[i], row, column)

        mainLayout.addWidget(self.digitButtons[0], 5, 1)
        mainLayout.addWidget(self.pointButton, 5, 2)
        mainLayout.addWidget(self.changeSignButton, 5, 3)

        mainLayout.addWidget(self.divisionButton, 2, 4)
        mainLayout.addWidget(self.timesButton, 3, 4)
        mainLayout.addWidget(self.minusButton, 4, 4)
        mainLayout.addWidget(self.plusButton, 5, 4)

        mainLayout.addWidget(self.squareRootButton, 2, 5)
        mainLayout.addWidget(self.powerButton, 3, 5)
        mainLayout.addWidget(self.reciprocalButton, 4, 5)
        mainLayout.addWidget(self.equalButton, 5, 5)
        self.setLayout(mainLayout)
        self.setWindowTitle("Kalkulator | Programmer Bojonegoro")

    def digitClicked(self):
        clickedButton = self.sender()
        digitValue = int(clickedButton.text())

        if self.display.text() == '0' and digitValue == 0.0:
            return

        if self.waitingForOperand:
            self.display.clear()
            self.waitingForOperand = False

        self.display.setText(self.display.text() + str(digitValue))

    def unaryOperatorClicked(self):
        clickedButton = self.sender()
        clickedOperator = clickedButton.text()
        operand = float(self.display.text())

        if clickedOperator == "Sqrt":
            if operand < 0.0:
                self.abortOperation()
                return

            result = math.sqrt(operand)
        elif clickedOperator == u"x\262":
            result = math.pow(operand, 2.0)
        elif clickedOperator == "1/x":
            if operand == 0.0:
                self.abortOperation()
                return

            result = 1.0 / operand

        self.display.setText(str(result))
        self.waitingForOperand = True

    def additiveOperatorClicked(self):
        clickedButton = self.sender()
        clickedOperator = clickedButton.text()
        operand = float(self.display.text())

        if self.pendingMultiplicativeOperator:
            if not self.calculate(operand, self.pendingMultiplicativeOperator):
                self.abortOperation()
                return

            self.display.setText(str(self.factorSoFar))
            operand = self.factorSoFar
            self.factorSoFar = 0.0
            self.pendingMultiplicativeOperator = ''

        if self.pendingAdditiveOperator:
            if not self.calculate(operand, self.pendingAdditiveOperator):
                self.abortOperation()
                return

            self.display.setText(str(self.sumSoFar))
        else:
            self.sumSoFar = operand

        self.pendingAdditiveOperator = clickedOperator
        self.waitingForOperand = True

    def multiplicativeOperatorClicked(self):
        clickedButton = self.sender()
        clickedOperator = clickedButton.text()
        operand = float(self.display.text())

        if self.pendingMultiplicativeOperator:
            if not self.calculate(operand, self.pendingMultiplicativeOperator):
                self.abortOperation()
                return

            self.display.setText(str(self.factorSoFar))
        else:
            self.factorSoFar = operand

        self.pendingMultiplicativeOperator = clickedOperator
        self.waitingForOperand = True

    def equalClicked(self):
        operand = float(self.display.text())

        if self.pendingMultiplicativeOperator:
            if not self.calculate(operand, self.pendingMultiplicativeOperator):
                self.abortOperation()
                return

            operand = self.factorSoFar
            self.factorSoFar = 0.0
            self.pendingMultiplicativeOperator = ''

        if self.pendingAdditiveOperator:
            if not self.calculate(operand, self.pendingAdditiveOperator):
                self.abortOperation()
                return

            self.pendingAdditiveOperator = ''
        else:
            self.sumSoFar = operand

        self.display.setText(str(self.sumSoFar))
        self.sumSoFar = 0.0
        self.waitingForOperand = True

    def pointClicked(self):
        if self.waitingForOperand:
            self.display.setText('0')

        if "." not in self.display.text():
            self.display.setText(self.display.text() + ".")

        self.waitingForOperand = False

    def changeSignClicked(self):
        text = self.display.text()
        value = float(text)

        if value > 0.0:
            text = "-" + text
        elif value < 0.0:
            text = text[1:]

        self.display.setText(text)

    def backspaceClicked(self):
        if self.waitingForOperand:
            return

        text = self.display.text()[:-1]
        if not text:
            text = '0'
            self.waitingForOperand = True

        self.display.setText(text)

    def clear(self):
        if self.waitingForOperand:
            return

        self.display.setText('0')
        self.waitingForOperand = True

    def clearAll(self):
        self.sumSoFar = 0.0
        self.factorSoFar = 0.0
        self.pendingAdditiveOperator = ''
        self.pendingMultiplicativeOperator = ''
        self.display.setText('0')
        self.waitingForOperand = True

    def clearMemory(self):
        self.sumInMemory = 0.0

    def readMemory(self):
        self.display.setText(str(self.sumInMemory))
        self.waitingForOperand = True

    def setMemory(self):
        self.equalClicked()
        self.sumInMemory = float(self.display.text())

    def addToMemory(self):
        self.equalClicked()
        self.sumInMemory += float(self.display.text())

    def createButton(self, text, member):
        button = Button(text)
        button.clicked.connect(member)
        return button

    def abortOperation(self):
        self.clearAll()
        self.display.setText("####")

    def calculate(self, rightOperand, pendingOperator):
        if pendingOperator == "+":
            self.sumSoFar += rightOperand
        elif pendingOperator == "-":
            self.sumSoFar -= rightOperand
        elif pendingOperator == u"\327":
            self.factorSoFar *= rightOperand
        elif pendingOperator == u"\367":
            if rightOperand == 0.0:
                return False

            self.factorSoFar /= rightOperand

        return True


if __name__ == '__main__':

    import sys

    app = QtGui.QApplication(sys.argv)
    calc = Calculator()
    sys.exit(calc.exec_())

Screenshoot hasil running program

Alhamdulillah, itulah source code untuk membuat aplikasi kalkulator dengan python menggunakan library pyside.

Semoga bermanfaat dan menambah wawasan teman-teman semua

Terimakasih

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