Python实现的简单计算器功能详解

 class CalcFrame(wx.Frame):#建造一个继承于wx.Frame的frame def __init__(self,title): wx.Frame.__init__ (self,None,-1,title, pos=(100,300),size=(300,320)) panel=wx.Panel(self) boxsize=wx.BoxSizer(wx.VERTICAL) gridBox=wx.GridSizer(4,4,1,1) self.equation=""#记录一个等式，把它print到TextCtrl中 

 self.textprint=wx.TextCtrl(panel,-1,'',style=wx.TE_RIGHT|wx.TE_READONLY)#文本控制控件 self.bgFont=wx.Font(25,wx.SWISS,wx.NORMAL,wx.BOLD,face=u'Roboto')#设置字体样式 self.textprint.SetFont(self.bgFont)#使用SetFont将设置的字体样式运用在textprint中 self.textprint.SetForegroundColour('black')#设置前景色 self.textprint.SetBackgroundColour('white')#设置后景色 

 self.buttonData="7 8 9 DEL 4 5 6 AC 1 2 3 * / + - =".split() #产生buttonIterm的label #将label分配到按钮上去 buttonLength=len(self.buttonData) for i in range(buttonLength): labels="%s" %self.buttonData[i] buttonIterm = wx.Button(panel,i,labels) self.createHandler(buttonIterm,labels) gridBox.Add(buttonIterm,0,flag=wx.EXPAND) 

 boxsize.Add(self.textprint,1,flag=wx.EXPAND)#在boxsize中加上文本控制控件，比例为1 boxsize.Add(gridBox,5,flag=wx.EXPAND) panel.SetSizerAndFit(boxsize)#将boxsize放入panel里 

 def createHandler(self,button,labels): #self.Bind(wx.EVT_BUTTON, self.OnButton1, self.Button1) #这里self是一个Frame（wxPython中的窗体这样的东西），而Button1是放在这个Frame下面的一个Button，self.OnButton1就是事件处理函数。而wxPython定死了事件处理函数的形式： items="DEL AC =" if labels not in items: self.Bind(wx.EVT_BUTTON,self.OnAppend,button) elif labels=='DEL': self.Bind(wx.EVT_BUTTON,self.OnDel,button) elif labels=='AC': self.Bind(wx.EVT_BUTTON,self.OnAc,button) elif labels=='=': self.Bind(wx.EVT_BUTTON,self.OnEqual,button) 

 def OnAppend(self,event): eventbutton = event.GetEventObject() label = eventbutton.GetLabel() self.equation += label self.textprint.SetValue(self.equation) def OnDel(self,event): self.equation=self.equation[:-1] self.textprint.SetValue(self.equation) def OnAc(self,event): self.textprint.Clear() self.equation="" def OnEqual(self,event): string=self.equation try: taget=eval(string)#执行这段代码得到的结果 self.equation=str(taget) self.textprint.SetValue(self.equation) except SyntaxError:#弹出消息对话框 dlg=wx.MessageDialog(self,u'输入格式错误',wx.Ok|wx.ICON_INFORMATION) dlg.ShowModal() dlg.Destory() 

 class App(wx.App): def OnInit(self): self.frame =CalcFrame(u'计算器') self.frame.Center() self.frame.Show() return True 

 if __name__=="__main__": app=App() app.MainLoop() 

 # -*- coding:utf-8 -*- ''' Created on 2018年8月25日 @author: Administrator ''' import wx class CalcFrame(wx.Frame):#建造一个继承于wx.Frame的frame def __init__(self,title): wx.Frame.__init__ (self,None,-1,title, pos=(100,300),size=(300,320)) panel=wx.Panel(self) boxsize=wx.BoxSizer(wx.VERTICAL) gridBox=wx.GridSizer(4,4,1,1) self.equation=""#记录一个等式，把它print到TextCtrl中 self.textprint=wx.TextCtrl(panel,-1,'',style=wx.TE_RIGHT|wx.TE_READONLY)#文本控制控件 self.bgFont=wx.Font(25,wx.SWISS,wx.NORMAL,wx.BOLD,face=u'Roboto')#设置字体样式 self.textprint.SetFont(self.bgFont)#使用SetFont将设置的字体样式运用在textprint中 self.textprint.SetForegroundColour('black')#设置前景色 self.textprint.SetBackgroundColour('white')#设置后景色 self.buttonData="7 8 9 DEL 4 5 6 AC 1 2 3 * / + - =".split() #产生buttonIterm的label #将label分配到按钮上去 buttonLength=len(self.buttonData) for i in range(buttonLength): labels="%s" %self.buttonData[i] buttonIterm = wx.Button(panel,i,labels) self.createHandler(buttonIterm,labels) gridBox.Add(buttonIterm,0,flag=wx.EXPAND) boxsize.Add(self.textprint,1,flag=wx.EXPAND)#在boxsize中加上文本控制控件，比例为1 boxsize.Add(gridBox,5,flag=wx.EXPAND) panel.SetSizerAndFit(boxsize)#将boxsize放入panel里 def createHandler(self,button,labels): #self.Bind(wx.EVT_BUTTON, self.OnButton1, self.Button1) #这里self是一个Frame（wxPython中的窗体这样的东西），而Button1是放在这个Frame下面的一个Button，self.OnButton1就是事件处理函数。而wxPython定死了事件处理函数的形式： items="DEL AC =" if labels not in items: self.Bind(wx.EVT_BUTTON,self.OnAppend,button) elif labels=='DEL': self.Bind(wx.EVT_BUTTON,self.OnDel,button) elif labels=='AC': self.Bind(wx.EVT_BUTTON,self.OnAc,button) elif labels=='=': self.Bind(wx.EVT_BUTTON,self.OnEqual,button) def OnAppend(self,event): eventbutton = event.GetEventObject() label = eventbutton.GetLabel() self.equation += label self.textprint.SetValue(self.equation) def OnDel(self,event): self.equation=self.equation[:-1] self.textprint.SetValue(self.equation) def OnAc(self,event): self.textprint.Clear() self.equation="" def OnEqual(self,event): string=self.equation try: taget=eval(string)#执行这段代码得到的结果 self.equation=str(taget) self.textprint.SetValue(self.equation) except SyntaxError:#弹出消息对话框 dlg=wx.MessageDialog(self,u'输入格式错误',wx.Ok|wx.ICON_INFORMATION) dlg.ShowModal() dlg.Destory() class App(wx.App): def OnInit(self): self.frame =CalcFrame(u'计算器') self.frame.Center() self.frame.Show() return True if __name__=="__main__": app=App() app.MainLoop()