1. Python代码：

 
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#!/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

 
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#!/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：