class MainForm(QtWidget):
def _init_(self):
super()._init_()
self.setupUi()
def setupUi(self):
self.resize(250, 250)
self.move(300, 300)
self.setWindowsTitle('Kalkulator')
self.lineEdit = QLineEdit()
self.lineEdit.setAlignment(Qt.AlignRight)
self.lineEdit.setFont(QFont('SansSerif', 14))
self.lineEdit.setDisabled(true)
self._7Button = QPushButton('7')
self._8Button = QPushButton('8')
self._9Button = QPushButton('9')
self.divButton = QPushButton('/')
self.clearButton = QPushButton("CLR")
self._4Button = QPushButton('4')
self._5Button = QPushButton('5')
self._6Button = QPushButton('6')
self.mulButton = QPushButton('x')
self._1Button = QPushButton('1')
self._2Button = QPushButton('2')
self._3Button = QPushButton('3')
self.minusButton = QPushButton('-')
self._0Button = QPushButton('0')
self.dotButton = QPushButton('.')
self.percentageButton = QPushButton('%')
self.plusButton = QPushButton('+')
self.calculateButton = QPushButton('=')
layout = QGridLayout()
layout.addWidget(self.lineEdit, 0, 0, 1, 4)
layout.addWidget(self._7Button, 1, 0)
layout.addWidget(self._8Button, 1, 1)
layout.addWidget(self._9Button, 1, 2)
layout.addWidget(self.clearButton, 1, 3)
layout.addWidget(self._4Button, 2, 0)
layout.addWidget(self._5Button, 2, 1)
layout.addWidget(self._6Button, 2, 2)
layout.addWidget(self.mulButton, 2, 3)
layout.addWidget(self._1Button, 3, 0)
layout.addWidget(self._2Button, 3, 1)
layout.addWidget(self._3Button, 3, 2)
layout.addWidget(self.divButton, 3, 3)
layout.addWidget(self._0Button, 4, 0)
layout.addWidget(self.dotButton, 4, 1)
layout.addWidget(self.minusButton, 4, 2)
layout.addWidget(self.plusButton, 4, 3)
layout.addWidget(self.percentageButton, 5, 0)
layout.addWidget(self.calculateButton, 5, 1, 1, 3)
self.setLayout(layout)
self._0Button.clicked.connect(lambda: self.writeDigit(0))
self._1Button.clicked.connect(lambda: self.writeDigit(1))
self._2Button.clicked.connect(lambda: self.writeDigit(2))
self._3Button.clicked.connect(lambda: self.writeDigit(3))
self._4Button.clicked.connect(lambda: self.writeDigit(4))
self._5Button.clicked.connect(lambda: self.writeDigit(5))
self._6Button.clicked.connect(lambda: self.writeDigit(6))
self._7Button.clicked.connect(lambda: self.writeDigit(7))
self._8Button.clicked.connect(lambda: self.writeDigit(8))
self._9Button.clicked.connect(lambda: self.writeDigit(9))
self.mulButton.clicked.connect(lambda: self.writeOperator('*'))
self.divButton.clicked.connect(lambda: self.writeOperator('/'))
self.plusButton.clicked.connect(lambda: self.writeOperator('+'))
self.minusButton.clicked.connect(lambda: self.writeOperator('-'))
self.dotButton.clicked.connect(self.writePoint)
self.clearButton.clicked.connect(self.lineEdit.clear)
self.calculateButton.clicked.connect(self.calculateButtonClick)
self.percentageButton.clicked.connect(self.percentageButtonClick)
def writeDigit(self, digit):
if digit in range(0, 10):
self.lineEdit.setText(self.lineEdit.text() + str(digit))
def writeOperator(self, operator):
if len(self.lineEdit.text()) == 0: return
if operator in ['*', '/', '+', '-']:
if self.lineEdit.text()[-1] in ['*', '/', '+', '-']:
self.lineEdit.setText(self.lineEdit.text()[:-1] +
operator)
else:
self.lineEdit.setText(self.lineEdit.text() + operator)
def writePoint(self):
if len(self.lineEdit.text()) == 0 or \
self.lineEdit.text() [-1] in ['*', '/', '+', '-']:
return
self.lineEdit.setText(self.lineEdit.text() + '.')
def calculateButtonClick(self):
expression = self.lineEdit.text()
if len(expression) == 0: return
try:
result = eval(expression)
self.lineEdit.setText(str(result))
except:
self.lineEdit.setText('ERROR')
def percentageButtonClick(self):
expression = self.lineEdit.text()
if len(expression) == 0: return
try:
result = eval(expression) / 100
self.lineEdit.setText(str(result))
except:
self.lineEdit.setText('ERROR')
