How to get a variable from Python file using IronPython

Question

I want to get a variable from my Python file and write it in the console here is what i have tried:

`main.py`

myVar = "Hello There"

`program.cs`

using System;
using IronPython.Hosting;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            var py = Python.CreateEngine();

            var pythonVariable = py.ExecuteFile("main.py");
            Console.WriteLine(pythonVariable);

            Console.Read();

        }
    }
}

I would expect the output to be 'Hello There' but I get this: 'Microsoft.Scripting.Hosting.ScriptScope'

Should you be printing the variable in the main.py? There is no output from that script — Alan Kavanagh
– Alan Kavanagh, Commented Dec 27, 2019 at 22:58

UnholySheep · Accepted Answer · 2019-12-27 23:19:59Z

The output you get is hinting what you have to look for. ExecuteFile returns a ScriptScope which contains all the variables defined in the executed Python code.

In order to retrieve a specific variable from it you need to use GetVariable or TryGetVariable (if the variable may not exist in the file), e.g.:

using System;
using IronPython.Hosting;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            var py = Python.CreateEngine();

            var pythonVariable = py.ExecuteFile("main.py").GetVariable<string>("myVar");
            Console.WriteLine(pythonVariable);

            Console.Read();

        }
    }
}

Note that I used the generic version of GetVariable to convert it to a string immediately. The non-generic version returns a dynamic object, choosing which one you need depends on how you intend to use the variable

manish bajaj · Accepted Answer · 2019-12-27 23:30:47Z

0

Follow this procedure and it should work, Be sure to have file in the right place. I don't see you setting any variables Do that and just follow the code:

var engine = Python.CreateEngine(); // Extract Python language engine from their grasp
            var source = engine.CreateScriptSourceFromFile(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "myPython.py"));
            var scope = engine.CreateScope();
            source.Execute(scope);
            var theVar = scope.GetVariable("myVar");

            Console.WriteLine(theVar);
            Console.ReadKey();

answered Dec 27, 2019 at 23:30

manish bajaj

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