I have been using the version of PythonDotNet from
https://github.com/renshawbay/pythonnet
for embedding - i.e. to call Python code in C# programs.
I have made a few changes to the source code in order to make using Python
objects in C# easier, or to fix problems.
Here are the changes:
1) In the source file “converter.cs” which defines the class
Python.Runtime.Converter,
I added the following to the switch case ‘TypeCode.Object’ in the ‘ToPython’
function:
case TypeCode.Object:
// The following ‘if’ clause is needed (as suggested by Patrick
Stewart) to make the examples in the README work.
if (value is IEnumerable)
{
using (var resultlist = new PyList())
{
foreach (object o in (IEnumerable)value)
{
Type oType = o.GetType();
TypeCode oTc = Type.GetTypeCode(oType);
// The following 'if' clause for Object entries is
needed so that the entries
// in lists of Python objects don't lose their
types.
// I.e. so that if you do something like:
// dynamic obj1 = myPythonClass();
// List<dynamic> myList = new List<dynamic> {
obj1 };
// myPythonFunc(myList);
// then the type of myList[0] inside myPythonFunc
will be the same as the type of obj1
// whereas the 'else' clause would make it be of
type Python.Runtime.PyObject
if (oTc == TypeCode.Object)
{
resultlist.Append((PyObject)o);
}
else
{
using (var p = new PyObject(ToPython(o, oType)))
resultlist.Append(p);
}
}
Runtime.Incref(resultlist.Handle);
return resultlist.Handle;
}
}
2) In the source file “pyobject.cs” which defines the class
Python.Runtime.PyObject,
I replaced the line:
this.SetAttr(binder.Name, (PyObject)value);
in the ‘if (this.HasAttr(binder.Name))’ clause in the function ‘TrySetMember’
with the following:
// Use ‘ToPython’ if an exception occurs when casting to (PyObject)
// Without this, get exception e.g. when assign a C# String to a
Python member
// like: myPyObj.name = name;
PyObject pyValue;
try
{
pyValue = (PyObject)value;
}
catch (Exception)
{
pyValue = value.ToPython();
}
this.SetAttr(binder.Name, pyValue);
I would be interested in any comments about these changes - especially if there
are better ways of fixing the problems.
I am also interested to hear if anyone has other improvements to suggest.
--
Cameron Hayne
cameron.ha...@introspect.ca
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