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.softyun.net/jisuanqi/equ_jisuanqi
科学计算器在线使用_高级计算器在线计算：
http://tools.softyun.net/jisuanqi/jsqkexue
在线计算器_标准计算器：
http://tools.softyun.net/jisuanqi/jsq
希望本文所述对大家Python程序设计有所帮助。
