/// <summary>
   /// This class will convert a C# list of strings to a Python list [] of strings.
   /// </summary>
   public class ListStringConversions : IPyObjectEncoder
   {
       bool IPyObjectEncoder.CanEncode(Type type)
       {
           return type == typeof(IList<string>);
       }

       PyObject IPyObjectEncoder.TryEncode(object value)
       {
           using (var scope = Py.CreateScope())
           {
               scope.Exec($"a = []");
               var input = (List<string>)value;
               foreach (var item in input)
                   scope.Exec($"a.append('{item}')");  // {item}
               return scope.Get("a");
           }
       }
   }

>       assert isinstance(codes, list)
E       assert False
E        +  where False = isinstance(<System.Collections.Generic.IList[String] object at 0x0000023C1D9D5180>, list)