python编写简单计算器的代码(用python编写计算器程序)
如何使用python编程写一个加法计算器
1、打开idle。点击file,然后点击new file.这是创建一个新的文件。
新建一个文件之后,我们输入第一行代码,使用print函数,在屏幕上打印一句话,其中字符串要使用双引号,输入法要使用英文输入法,如果符号使用中文输入法输入,就会出现错误。print("我们做一个两个整数相加的计算题!")
同理,在屏幕上打印第二句话,与用户交互,提醒用户输入第一个数。
第三行调用input函数,将用户输入的内容赋值给a,这时候a收到的是字符串信息,所以需要下一步把字符串转换为整型。这输入计算机处理数据指令。
然后依照以上的步骤写第二个加数,和最后输出的和,注意最后一句打印结果时,引号内部是字符串形式,x+y是数值形式,所以需要在中间加上一个逗号。如果不加逗号就会提示错误信息,以上就是所有的程序编写完成,下一步就开始保存,命名,运行。如图所示
运行结果如下:
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用python编程设计一个简单的计算器程序,要求用户从键盘输入如下形式的表达式:
用exec?函数
小提示:
a?=?3
b?=?4
op?=?'*'?
exec('c?=?%s?%s?%s'%(a,op,b))
print?c
如何用python编写计算器
我想你的需求应该是一个图形界面的程序,而不是简单的在命令行上输入。
那么,要做的第一件事就是选择一个图形界面套件。可以使用原生的TK,也可以用跨平台性能很好的wxPython,或者是整体结构很像MFC的PyWin32。至于pyGTK,pyQT,都是可选的,但是相对来说文档比较少,学习不便。
选定图形库之后,就可以看文档范例了。计算器总体是比较简单的。我记得WxPython的demo里直接就有一个简单计算器,您可以直接取来用。
python计算器
python计算器实现:
wx.TextCtrl(文本输入控件),这个作为计算器的显示屏,点击数字时用AppendText方法将数字添加至文本末尾,要取出数字时用GetValue方法,点击运算符时要将文本框中的数字清空(先存储)用Clear方法然后还有将操作符保存,点击等号后要将第二个操作数存储,然后用int方法将字符串转换为数字,计算后用SetValue方法将结果送入文本框,具体代码如下:
import?wx
#?begin?wxGlade:?extracode
#?end?wxGlade
class?MyFrame(wx.Frame):
????def?__init__(self,?*args,?**kwds):
????????#?begin?wxGlade:?MyFrame.__init__
????????kwds["style"]?=?wx.DEFAULT_FRAME_STYLE
????????wx.Frame.__init__(self,?*args,?**kwds)
????????self.text_ctrl_1?=?wx.TextCtrl(self,?-1,?"",style=wx.TE_READONLY)
????????self.button_37?=?wx.Button(self,?-1,?"1")
????????self.button_38?=?wx.Button(self,?-1,?"2")
????????self.button_39?=?wx.Button(self,?-1,?"3")
????????self.button_40?=?wx.Button(self,?-1,?"+")
????????self.button_41?=?wx.Button(self,?-1,?"4")
????????self.button_42?=?wx.Button(self,?-1,?"5")
????????self.button_43?=?wx.Button(self,?-1,?"6")
????????self.button_44?=?wx.Button(self,?-1,?"-")
????????self.button_46?=?wx.Button(self,?-1,?"7")
????????self.button_45?=?wx.Button(self,?-1,?"8")
????????self.button_47?=?wx.Button(self,?-1,?"9")
????????self.button_48?=?wx.Button(self,?-1,?"x")
????????self.button_49?=?wx.Button(self,?-1,?"C")
????????self.button_50?=?wx.Button(self,?-1,?"0")
????????self.button_51?=?wx.Button(self,?-1,?"=")
????????self.button_52?=?wx.Button(self,?-1,?"/")
????????self.__set_properties()
????????self.__do_layout()
????????self.Bind(wx.EVT_BUTTON,?self.bu1,?self.button_37)
????????self.Bind(wx.EVT_BUTTON,?self.bu2,?self.button_38)
????????self.Bind(wx.EVT_BUTTON,?self.bu3,?self.button_39)
????????self.Bind(wx.EVT_BUTTON,?self.bu_plus,?self.button_40)
????????self.Bind(wx.EVT_BUTTON,?self.bu4,?self.button_41)
????????self.Bind(wx.EVT_BUTTON,?self.bu5,?self.button_42)
????????self.Bind(wx.EVT_BUTTON,?self.bu6,?self.button_43)
????????self.Bind(wx.EVT_BUTTON,?self.bu_min,?self.button_44)
????????self.Bind(wx.EVT_BUTTON,?self.bu7,?self.button_46)
????????self.Bind(wx.EVT_BUTTON,?self.bu8,?self.button_45)
????????self.Bind(wx.EVT_BUTTON,?self.bu9,?self.button_47)
????????self.Bind(wx.EVT_BUTTON,?self.bu_mul,?self.button_48)
????????self.Bind(wx.EVT_BUTTON,?self.bu_clear,?self.button_49)
????????self.Bind(wx.EVT_BUTTON,?self.bu0,?self.button_50)
????????self.Bind(wx.EVT_BUTTON,?self.bu_result,?self.button_51)
????????self.Bind(wx.EVT_BUTTON,?self.bu_chu,?self.button_52)
????????#?end?wxGlade
????????self.Show(True)
????def?__set_properties(self):
????????#?begin?wxGlade:?MyFrame.__set_properties
????????self.SetTitle("Python?Calculater?by?CYG")
????????self.text_ctrl_1.SetMinSize((400,?50))
????????self.button_37.SetMinSize((100,?50))
????????self.button_38.SetMinSize((100,?50))
????????self.button_39.SetMinSize((100,?50))
????????self.button_40.SetMinSize((100,?50))
????????self.button_41.SetMinSize((100,?50))
????????self.button_42.SetMinSize((100,?50))
????????self.button_43.SetMinSize((100,?50))
????????self.button_44.SetMinSize((100,?50))
????????self.button_46.SetMinSize((100,?50))
????????self.button_45.SetMinSize((100,?50))
????????self.button_47.SetMinSize((100,?50))
????????self.button_48.SetMinSize((100,?50))
????????self.button_49.SetMinSize((100,?50))
????????self.button_50.SetMinSize((100,?50))
????????self.button_51.SetMinSize((100,?50))
????????self.button_52.SetMinSize((100,?50))
????????#?end?wxGlade
????def?__do_layout(self):
????????#?begin?wxGlade:?MyFrame.__do_layout
????????sizer_2?=?wx.BoxSizer(wx.VERTICAL)
????????sizer_3?=?wx.BoxSizer(wx.VERTICAL)
????????grid_sizer_1?=?wx.GridSizer(4,?4,?0,?0)
????????sizer_3.Add(self.text_ctrl_1,?0,?0,?0)
????????grid_sizer_1.Add(self.button_37,?0,?0,?0)
????????grid_sizer_1.Add(self.button_38,?0,?0,?0)
????????grid_sizer_1.Add(self.button_39,?0,?0,?0)
????????grid_sizer_1.Add(self.button_40,?0,?0,?0)
????????grid_sizer_1.Add(self.button_41,?0,?0,?0)
????????grid_sizer_1.Add(self.button_42,?0,?0,?0)
????????grid_sizer_1.Add(self.button_43,?0,?0,?0)
????????grid_sizer_1.Add(self.button_44,?0,?0,?0)
????????grid_sizer_1.Add(self.button_46,?0,?0,?0)
????????grid_sizer_1.Add(self.button_45,?0,?0,?0)
????????grid_sizer_1.Add(self.button_47,?0,?0,?0)
????????grid_sizer_1.Add(self.button_48,?0,?0,?0)
????????grid_sizer_1.Add(self.button_49,?0,?0,?0)
????????grid_sizer_1.Add(self.button_50,?0,?0,?0)
????????grid_sizer_1.Add(self.button_51,?0,?0,?0)
????????grid_sizer_1.Add(self.button_52,?0,?0,?0)
????????sizer_3.Add(grid_sizer_1,?1,?wx.EXPAND,?0)
????????sizer_2.Add(sizer_3,?1,?wx.EXPAND,?0)
????????self.SetSizer(sizer_2)
????????sizer_2.Fit(self)
????????self.Layout()
????????#?end?wxGlade
????def?bu1(self,?event):??#?wxGlade:?MyFrame.event_handler
????????self.text_ctrl_1.AppendText("1")
????????event.Skip()
????def?bu2(self,?event):??#?wxGlade:?MyFrame.event_handler
????????self.text_ctrl_1.AppendText("2")
????????event.Skip()
????def?bu3(self,?event):??#?wxGlade:?MyFrame.event_handler
????????self.text_ctrl_1.AppendText("3")
????????event.Skip()
????def?bu_plus(self,?event):??#?wxGlade:?MyFrame.event_handler
????????self.num1=self.text_ctrl_1.GetValue()
????????self.op="+"
????????self.text_ctrl_1.Clear()
????????event.Skip()
????def?bu4(self,?event):??#?wxGlade:?MyFrame.event_handler
????????self.text_ctrl_1.AppendText("4")
????????event.Skip()
????def?bu5(self,?event):??#?wxGlade:?MyFrame.event_handler
????????self.text_ctrl_1.AppendText("5")
????????event.Skip()
????def?bu6(self,?event):??#?wxGlade:?MyFrame.event_handler
????????self.text_ctrl_1.AppendText("6")
????????event.Skip()
????def?bu_min(self,?event):??#?wxGlade:?MyFrame.event_handler
????????self.num1=self.text_ctrl_1.GetValue()
????????self.op="-"
????????self.text_ctrl_1.Clear()
????????event.Skip()
????def?bu7(self,?event):??#?wxGlade:?MyFrame.event_handler
????????self.text_ctrl_1.AppendText("7")
????????event.Skip()
????def?bu8(self,?event):??#?wxGlade:?MyFrame.event_handler
????????self.text_ctrl_1.AppendText("8")
????????event.Skip()
????def?bu9(self,?event):??#?wxGlade:?MyFrame.event_handler
????????self.text_ctrl_1.AppendText("9")
????????event.Skip()
????def?bu_mul(self,?event):??#?wxGlade:?MyFrame.event_handler
????????self.num1=self.text_ctrl_1.GetValue()
????????self.op="x"
????????self.text_ctrl_1.Clear()
????????event.Skip()
????def?bu_clear(self,?event):??#?wxGlade:?MyFrame.event_handler
????????self.text_ctrl_1.Clear()
????????event.Skip()
????def?bu0(self,?event):??#?wxGlade:?MyFrame.event_handler
????????self.text_ctrl_1.AppendText("0")
????????event.Skip()
????def?bu_chu(self,?event):??#?wxGlade:?MyFrame.event_handler
????????self.num1=self.text_ctrl_1.GetValue()
????????self.op="/"
????????self.text_ctrl_1.Clear()
????????event.Skip()
????def?bu_result(self,?event):??#?wxGlade:?MyFrame.event_handler
????????self.num2=self.text_ctrl_1.GetValue()
????????num1=int(self.num1)
????????num2=int(self.num2)
????????if?self.op=="+":
????????????self.text_ctrl_1.SetValue(str(num1+num2))
????????elif?self.op=="-":
????????????self.text_ctrl_1.SetValue(str(num1-num2))
????????elif?self.op=="x":
????????????self.text_ctrl_1.SetValue(str(num1*num2))
????????elif?self.op=="/":
????????????self.text_ctrl_1.SetValue(str(num1/num2))
????????event.Skip()
#?end?of?class?MyFrame
if?__name__?==?"__main__":
????app=wx.App(False)
????myframe=MyFrame(None)
????app.MainLoop()