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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_())