Python开发的实用计算器完整实例

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本文实例讲述了Python开发的实用计算器。分享给大家供大家参考,具体如下:

实现功能:图形界面PyQt,输入框,+,―,*,/ ;乘方 ,开方 ,取余,清零。

1. Python代码:


    #!/usr/bin/env python
    # -*- coding: utf-8 -*-
    '''
    Author : Mr.LiuYC
    Created on 2014-09-30
    E-Mail : liuyanchen0725@gmail.com
    Introduction: 简易计算器 实现图形界面PyQt,输入框,+,―,*,/ ;乘方 ,开方 ,取余,清零。
    '''
    from PyQt4 import QtGui,QtCore
    import sys , math , string
    class 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.LiuYC
    Created on 2014-09-30
    E-Mail : liuyanchen0725@gmail.com
    Introduction: 简易计算器 实现图形界面PyQt,输入框,+,―,*,/ ;乘方 ,开方 ,取余,清零。
    '''
    from PyQt4 import QtGui,QtCore
    import sys , math , string
    class 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_())

3. 运行效果图如下:

PS:这里再为大家推荐几款计算工具供大家进一步参考借鉴:

在线一元函数(方程)求解计算工具:
http://tools.jb51.net/jisuanqi/equ_jisuanqi

科学计算器在线使用_高级计算器在线计算:
http://tools.jb51.net/jisuanqi/jsqkexue

在线计算器_标准计算器:
http://tools.jb51.net/jisuanqi/jsq

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