本文實例講述了Python開發的實用計算器。分享給大家供大家參考，具體如下：

實現功能：圖形界面PyQt，輸入框，+，—，*，/ ；乘方 ，開方 ，取余，清零。

1. Python代碼：

#!/usr/bin/env python# -*- coding: utf-8 -*-'''Author : Mr.LiuYCCreated on 2014-09-30E-Mail : liuyanchen0725@gmail.comIntroduction: 簡易計算器 實現圖形界面PyQt，輸入框，+，—，*，/ ；乘方 ，開方 ，取余，清零。'''from PyQt4 import QtGui,QtCoreimport sys , math , stringclass Example(QtGui.QWidget):  def __init__(self,parent=None):    QtGui.QWidget.__init__(self,parent=parent)    self.initUI()    self.last = []  def initUI(self):    list = ['%','**','sqrt','C',7,8,9,'+',4,5,6,'-',1,2,3,'*',0,'.','=','/']    length = len(list)    for i in xrange(length):      self.button = QtGui.QPushButton(str(list[i]),self)      self.button.clicked.connect(self.onButtonClick)      x = i % 4      y = i / 4      self.button.move(x * 40 + 10,y * 40 + 90)      self.button.resize(30,30)    self.lineEdit = QtGui.QLineEdit('',self)    self.lineEdit.move(10,10)    self.lineEdit.resize(150,70)    self.setGeometry(200, 200, 170, 300)    self.setWindowTitle('Quit buttom')    self.show()  def onButtonClick(self):    t = self.lineEdit.text()    new = self.sender().text()    self.last.append(new)    print self.last    self.lineEdit.setText(t+new)    if new == '=':      result = eval(str(t))      self.lineEdit.setText(str(result))    if new == 'C':      self.lineEdit.setText('')    if new == 'sqrt':      self.lineEdit.setText('')      result = math.sqrt(string.atof(t))      self.lineEdit.setText(str(result))if __name__ == '__main__':  app = QtGui.QApplication(sys.argv)  e = Example()  sys.exit(app.exec_())

2. calculator.py

#!/usr/bin/env python# -*- coding: utf-8 -*-'''Author : Mr.LiuYCCreated on 2014-09-30E-Mail : liuyanchen0725@gmail.comIntroduction: 簡易計算器 實現圖形界面PyQt，輸入框，+，—，*，/ ；乘方 ，開方 ，取余，清零。'''from PyQt4 import QtGui,QtCoreimport sys , math , stringclass Example(QtGui.QWidget):  def __init__(self,parent=None):    QtGui.QWidget.__init__(self,parent=parent)    self.initUI()    self.last = []  def initUI(self):    list = ['%','**','sqrt','C',7,8,9,'+',4,5,6,'-',1,2,3,'*',0,'.','=','/']    length = len(list)    for i in xrange(length):      self.button = QtGui.QPushButton(str(list[i]),self)      self.button.clicked.connect(self.onButtonClick)      x = i % 4      y = i / 4      self.button.move(x * 40 + 10,y * 40 + 90)      self.button.resize(30,30)    self.lineEdit = QtGui.QLineEdit('',self)    self.lineEdit.move(10,10)    self.lineEdit.resize(150,70)    self.setGeometry(200, 200, 170, 300)    self.setWindowTitle('Quit buttom')    self.show()  def onButtonClick(self):    t = self.lineEdit.text()    new = self.sender().text()    self.last.append(new)    print self.last    self.lineEdit.setText(t+new)    if new == '=':      result = eval(str(t))      self.lineEdit.setText(str(result))    if new == 'C':      self.lineEdit.setText('')    if new == 'sqrt':      self.lineEdit.setText('')      result = math.sqrt(string.atof(t))      self.lineEdit.setText(str(result))if __name__ == '__main__':  app = QtGui.QApplication(sys.argv)  e = Example()  sys.exit(app.exec_())