Python开发的实用计算器完整实例

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：

希望本文所述对大家Python程序设计有所帮助。