num1=arg1 
num2=arg2 
op=arg3 
if op==1: 
 result=num1+num2 
elif op==2: 
 result=num1-num2 
elif op==3: 
 result=num1*num2 
else: 
 result=num1*1.0/num2 

<?xml version="1.0" encoding="utf-8" ?> 
<configuration> 
 <configSections> 
 <section name="microsoft.scripting" type="Microsoft.Scripting.Hosting.Configuration.Section, Microsoft.Scripting"/> 
 </configSections> 
 <microsoft.scripting> 
 <languages> 
  <language names="IronPython;Python;py" extensions=".py" displayName="Python" type="IronPython.Runtime.PythonContext, IronPython"/> 
 </languages> 
 </microsoft.scripting> 
 <startup> 
  <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" /> 
 </startup> 
</configuration> 

private void btnCalculate_Click(object sender, EventArgs e) 
  { 
   ScriptRuntime scriptRuntime = ScriptRuntime.CreateFromConfiguration(); 
   ScriptEngine rbEng = scriptRuntime.GetEngine("python"); 
   ScriptSource source = rbEng.CreateScriptSourceFromFile("IronPythonDemo.py");//设置脚本文件 
   ScriptScope scope = rbEng.CreateScope(); 
 
   try 
   { 
    //设置参数 
    scope.SetVariable("arg1",Convert.ToInt32(txtNum1.Text)); 
    scope.SetVariable("arg2", Convert.ToInt32(txtNum2.Text)); 
    scope.SetVariable("arg3", operation.SelectedIndex+1); 
   } 
   catch (Exception) 
   { 
    MessageBox.Show("输入有误。"); 
   } 
 
   source.Execute(scope); 
   labelResult.Text = scope.GetVariable("result").ToString(); 
  }