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Python開發(fā)的實用計算器完整實例

更新時間：2017年05月10日 11:52:43 作者：lyc0725

這篇文章主要介紹了Python開發(fā)的實用計算器,結(jié)合完整實例形式分析了Python實現(xiàn)計算器四則運算、開方、取余等相關(guān)操作技巧,需要的朋友可以參考下

本文實例講述了Python開發(fā)的實用計算器。分享給大家供大家參考，具體如下：

實現(xiàn)功能：圖形界面PyQt，輸入框，+，—，*，/ ；乘方，開方，取余，清零。

1. Python代碼：

#!/usr/bin/env python
# -*- coding: utf-8 -*-
'''
Author : Mr.LiuYC
Created on 2014-09-30
E-Mail : liuyanchen0725@gmail.com
Introduction: 簡易計算器 實現(xiàn)圖形界面PyQt，輸入框，+，—，*，/ ；乘方 ，開方 ，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: 簡易計算器 實現(xiàn)圖形界面PyQt，輸入框，+，—，*，/ ；乘方 ，開方 ，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. 運行效果圖如下：