Script arguments and Embedded IronPython

Question

I have an embedded scripting engine in my C# application that uses IronPython 2. I create the Python runtime and add a few classes to the global namespace so that the script can import them as modules.

However, one (pretty basic) thing I can't figure out is how to send script arguments. I realize that I could just create a variable with a list of arguments, but there must be a proper way to do it. Also, doing it in the proper 'Python' way allows me to compile the scripts and use an automated document builder called Sphinx. So the ultimate goal is to be able to use:

import sys
sys.argv

In one of my scripts and have it get the arguments the user specified (through the C# app).

Right now, I call the script by using:

// set up iron python runtime engine
_engine = Python.CreateEngine();
_runtime = _engine.Runtime;
_scope = _engine.CreateScope();

// run script
_script = _engine.CreateScriptSourceFromFile(_path);
_script.Execute(_scope);

And I've tried searching for an API to add script arguments with no luck. I've also tried appending them to the script path (_path in example) with no luck. I tried with CreateScriptSourceFrom File and CreateScriptSourceFromSting (which was a long shot anyway...).

Is what I'm trying to do even possible?

Simon Opelt · Accepted Answer · 2012-06-01 21:59:15Z

6

When you create the engine, you can add an "Arguments" option the contains your arguments:

IDictionary<string, object> options = new Dictionary<string, object>();
options["Arguments"] = new [] { "foo", "bar" };
_engine = Python.CreateEngine(options);

Now sys.argv will contain ["foo", "bar"].

You can set options["Arguments"] to anything that implements ICollection<string>.

edited Jun 1, 2012 at 21:59

Simon Opelt

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answered Oct 21, 2009 at 16:31

Jeff Hardy

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2 Comments

Jeff Hardy Over a year ago

You didn't specify the version, but this might require 2.6 - I don't have 2.0 around to check.

Chris Over a year ago

Is there anything additional required on the python script side for this to work?

Ana Betts · Accepted Answer · 2009-10-21 14:55:46Z

1

sys.argv is going to eventually be returning the actual parameters passed into the hosting app. Here's a few ways to solve this:

Rewrite your script to accept Global Variables, then use ScriptScope.SetVariable
Run the script, but rely on it to actually return you a class, which you can invoke methods on (much easier in 4.0 with dynamic keyword)
Override sys.argv with your own implementation (this is a dynamic language after all!)

answered Oct 21, 2009 at 14:55

Ana Betts

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1 Comment

cgyDeveloper Over a year ago

Hmmm... I think #3 will be the way to go. I suppose I will have to execute 'import sys' and 'sys.argv = args' in my ScriptScope as statements from C#? Then 'import sys' and 'args = sys.argv' in my script would work, yes? I have to do it this way in the script (import sys when sys exists) to get Sphinx to recognize my scripts as valid Python and create documentation.

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