Recent changes to support-requests

update license to MIT

2016-08-14T06:03:47.705000Z

We propose to update license to MIT. We need permission from @tiran @barton_c @hardcoded

One issue about multi-threading on python for DotNet

2015-03-05T14:05:10.886000Z

Hi there,

I am using python for DotNet, I have to say, it is great.

As we know, cpython has the Global Interpreter Lock (GIL) on multi-threading. So it can not use multi-core.

So I have one question, if I import CLR and use System.Threading on python for .net, but don't use cpython threading,

My question: Does it still has GIL on multi-threading if I use DotNet threading lib? Can it use multi-core use DotNet threading lib.

I know IronPython has no GIL and multi-threaded code can use multi core processors. So I pay attention this issue, on python for dotnet, if I use DotNet threading lib instead of cPython threading lib, Can multi-threaded code use multi core, it still has GIL?

I look forward to your reply.

Regards

Longhui Xiong

Possible bug in genericutil.cs (static Register method), and some support questions

2013-10-29T00:58:07.890000Z

This is my first time trying Python for .NET and I must say that this is an excellent resource. This is also my first time developing with Python, so I have a couple of questions at the end of this request. I am, however, a very seasoned C# and C/C++ developer.

For reference, I am using Visual Studio Ultimate 2012 (with Update 3) and the .Net 4.0 32-bit runtime, Python 2.7.5 through the latest Spyder and Python(x,y) downloads. I downloaded the latest source snapshot for Python for .NET, and debugged through both the clrmodule.il and Python.Runtime source to find the cause of this error. I'm not sure that the fix I put in is correct, but here is what I was seeing...

After the following Python source line:

import clr

I was receiving the console output message:

SystemError: dynamic module not initialized properly

I have my very short Python source file (Test.py) and the Python for .NET dll, pdb, and clr.pyd in the same folder (along with my C# dll in the same folder).

I traced the error all the way into the GenericUtil.Register(Type t) static method when it was trying to Register the EmptyArray`1 type name (By the way, this is the only type name that was trying to register with a Namepace == null)

The EmptyArray`1 Type has the Namespace property (string) set to null.

The code in the Register method that tries to get the Namespace value:

mapping.TryGetValue(t.Namespace, out nsmap);

causes an ArgumentNullException when the key value (t.Namespace) is null.

To fix the error, I just check for t.Namespace == null at the top of the method and immediately return from the method if it is null:

   //====================================================================
    // Register a generic type that appears in a given namespace.
    //====================================================================

    internal static void Register(Type t) {
        if (t.Namespace == null) {
            return;
        }
        Dictionary<string, List<string>> nsmap = null;
        mapping.TryGetValue(t.Namespace, out nsmap);
        if (nsmap == null) {
            nsmap = new Dictionary<string, List<string>>();
            mapping[t.Namespace] = nsmap;
        }
        string basename = t.Name;
        int tick = basename.IndexOf("`");
        if (tick > -1) {
            basename = basename.Substring(0, tick);
        }
        List<string> gnames = null;
        nsmap.TryGetValue(basename, out gnames);
        if (gnames == null) {
            gnames = new List<string>();
            nsmap[basename] = gnames;
        }
        gnames.Add(t.Name);
    }

This fix allowed me to then successfully import and use the Python for .NET functionality. I'm not sure how to get this fix into the source and/or binaries for general use. So, I'll leave that up to you.

I don't want to take too much of your time, but I do have some questions (and these are due to the fact that I'm not a Python developer, yet):

Here is my simple Test.py code:

-- coding: utf-8 --

"""
Created on Thu Oct 24 16:08:49 2013

@author: dwittma
"""

import clr

from System import *

clr.AddReference("CoreTypes")

from QuantaSoft import ProcessedWriter

print ProcessedWriter.doc

pr = ProcessedWriter.OverloadsString, String, Boolean, String, Nullable[DateTime], Boolean

pr.Close()

and here is the console output:

runfile('D:/MyPython/Test.py', wdir=r'D:/MyPython')
Void .ctor(System.String, Boolean)
Void .ctor(System.String, System.String, Boolean, System.String, System.Nullable`1[System.DateTime], Boolean)
Traceback (most recent call last):
File "", line 1, in
File "C:\Python27\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.py", line 540, in runfile
execfile(filename, namespace)
File "D:/MyPython/Test.py", line 18, in
pr = ProcessedWriter.OverloadsString, String, Boolean, String, Nullable[DateTime], Boolean
TypeError: no constructor matches given arguments

My C# overloaded constructor looks like this:

public ProcessedWriter(string fileName, string channelDescriptor, bool columnBasedAcquisitionOrder,
string fileComments = QLBFileConst.EmptyString, DateTime? dateTime = null, bool appendChecksum = false)

My questions are:

How do I handle the Nullable (or DateTime?) type and how to pass an equivalent Python null argument for this type?

And, as you can see, I have optional defaulted parameters in the constructor. How does Python for .NET handle these? (i.e., how to specify that they are optional, or must I pass in all arguments, even if the parameters are defaulted and optional)

Thanks,

-Dean

Call .net from python

2012-04-05T23:32:10Z

Hi,

I have some projects that i need to call .net dll from python. It contains namespaces and classed, and functions are embedded in the classes.
How should i call locate these functions and call them without using IronPython? Is there any detail instruction that i can follow?

Thank you very much.

Embedding - Remoting

2012-03-12T04:28:47Z

I found stack corruption is caused while invoking
C/C++ Native/CLR calls somefunction1 in C# Module,
somefunction1 calls Python.Net invokation (PyObject_Call, etc) method,
While current Instruction Pointer (IP) is in python vm (which python modifies thread fs), then .NET GC kicks in,
GC looks up for thread fs, err, something is wrong. bam. stack corruption.

i've tried all python invocation method, all same.
tried to Hold GC running while invoke, it was impossible. :)

so I've end at.

public static IPyObject InvokeSafe(this IPyObject inst, params IPyObject[] args)
{
PyTuple t = new PyTuple(args);

        IntPtr r;

        if \(PythonEngine.IsRemoteAvailable\)
            r = PythonEngine.RemoteInvoke\(inst.Object, t.Object, IntPtr.Zero\);
        else
        \{
            st.Restart\(\); 
            r = Runtime.PyEval\_CallObjectWithKeywords\(inst.Object, t.Object, IntPtr.Zero\);
            st.Stop\(\);

            if \(st.ElapsedMilliseconds &gt;= 1000\)
                Console.WriteLine\("Invoke: \{0\} took \{1\}", inst, st.ElapsedMilliseconds\);
        \}

        if \(r == IntPtr.Zero\)
        \{
            if \(PythonEngine.IsRemoteAvailable\)
                throw PythonEngine.SafeCreatePythonException\(\);
            else
                throw new PythonException\(\);
        \}

        return new PyObject\(r\);
    \}

RemoteInvokation...
Another native thread waits for remoting, python.net calls remoting method, native thread runs. python net waits for method ends.
Works very well.

Import build in module adn execute the statements

2011-10-13T15:55:18Z

I am trying to embedded python with C#

I need to execute commands like this

print math.sin(90)

I am writing my code in C# using wrapper classes.

I wrote my code like this

public void TestCommandFileExecution(string code)
{

IntPtr modulePtr = Runtime.PyImport_ImportModule("math");

IntPtr appPtr = Runtime.PyEval_GetBuiltins();

IntPtr srcCompilation = Runtime.Py_CompileString(code, "<stdin>", Runtime.Py_single_input); // I even tried making this into Py_file_input but no change

IntPtr execution = ExtendedRuntime.PyEval_EvalCode(srcCompilation, appPtr, IntPtr.Zero);
Runtime.PyErr_Print();

}
And I am sending a code like this

CommandFileExecution("print 'test!'"); // Working fine

CommandFileExecution("print math.sin(90)"); // Showing a error like this.

Traceback <most recent call last>:
File”<stdin>”, line 1,in <module>
NameError: name ‘math’ is not defined

Please help me

Thank you
Manoj

py2.5

2007-02-20T23:27:19Z

Tried to compile, but could not find any instructions... Could you please provide binaries for
Python 2.5 against CLR 1.1