How to get a DLR representation from C#?
if (obj is IronPython.Runtime.List) {
          repr = ((IronPython.Runtime.List)obj).__repr__(
                  IronPython.Runtime.DefaultContext.Default);
        } else if (obj is IronPython.Runtime.PythonDictionary) {
          repr = ((IronPython.Runtime.PythonDictionary)obj).__repr__(
                  IronPython.Runtime.DefaultContext.Default);

var engine = Python.CreateEngine();
dynamic obj = engine.Execute("[1, 2, 3, 4, 5]");
dynamic builtin = engine.GetBuiltinModule();
string repr = builtin.str(obj);

string repr = (string)engine.Execute("str([1, 2, 3, 4, 5])");

string repr = IronPython.Runtime.Operations.PythonOps.ToString(obj);

var engine = Ruby.CreateEngine();
string repr = (string)engine.Execute("[1, 2, 3, 4, 5].to_s");