I'm excited to find ways to make the Python.Runtime more useful/usable.
I'll gladly accept and apply patches. I'll not pick up on the whole
"dynamic type" thing. I do get your point.
Again, pray tell, what (computer) language did the original post
demonstrate?
Thanks,
Barton
On 01/29/2013 05:23 AM, Pierre-Yves Strub wrote:
Hi,
Not going to a jargon war, I was not speaking about the "dynamic type
system" of C#, but the dynamic type of an object (or runtime type if
you prefer) as opposed to its static one. Moreover, C# 4.0 is
dynamically typed too:
namespace Test {
class Program {
static void plop(string _s) {
}
static void Main(string[] args) {
dynamic foo = 0;
foo.callMyMethod(0);
Program.plop(foo);
}
}
}
Coming back to my initial mail, I would be surprised that returning
the lowest type in the Python.Runtime.Py* hierarchy adds such an
overhead (meaning, it only has to happen when crossing the Python ->
.NET border and is a single switch - for instance PyQt is doing such a
work and does not suffer from performance problems).
Anyway, I would be perfectly happy with some (kind of) downcast
function in PyObject that I could call on the returned managed python
values. Currently, I added such a function using F# type extensions,
but I can create patches against the current trunk if you accept them.
Pierre-Yves.
On 01/29/2013 12:03 PM, Barton wrote:
python dynamically typed: Yes
C# dynamically typed: No, strongly typed. It uses lots of overloads to
return the required type.
I suppose some embedder somewhere has a neat way of applying the type
info on the PyObject to some sort of wrapper.
What language is that, anyway? It looks sort of interesting.
Barton
On 01/28/2013 08:05 AM, Pierre-Yves Strub wrote:
Hi,
While playing with the .NET python runtime (see code bellow), I have
been surprised to see that the dynamic type of all values returned by
the runtime is PyObject. For instance, in the latter example, I would
expect "sum" to be of dynamic type PyInt and to be able to write (sum
:?> PyInt) instead of (PyInt.AsInt sum). Is it a "feature" of the
runtime binding ?
let entry () =
PythonEngine.Initialize ()
use lock = new PythonEngineLock () in
use builtin = PythonEngine.ImportModule ("__builtin__") in
use data =
new PyList
(data |> Array.map (fun i -> new PyInt (i) :> PyObject)) in
use sum = builtin.GetAttr("sum").Invoke([|data :>
PyObject|]) in
printfn "%A" (sum.GetType ());
printfn "%A" (sum.GetPythonType ())
Best,
Pierre-Yves.
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