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Python int type is translated to pyInt when passed as a .net Dictionary value only in 3.x version #1755

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athulds opened this issue Apr 6, 2022 · 3 comments · Fixed by #1762
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Python int type is translated to pyInt when passed as a .net Dictionary value only in 3.x version #1755

athulds opened this issue Apr 6, 2022 · 3 comments · Fixed by #1762

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@athulds
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athulds commented Apr 6, 2022 •
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Environment

  • Pythonnet version: 3.0.0a2
  • Python version: 3.7, 3.8, 3.9, 3.10
  • Operating System: Windows
  • .NET Runtime: 4.7.2 framework

Details

After upgrading to pre release 3.0.0a2 version, the python int type is getting translated to PyInt instead of System.int32 inside the .NET DLL, and hence getting a unable to cast exception. this is working fine in 2.x version.

DLL method:

public void DictMethod(Dictionary<string, object> paramDict)
  {
            Console.WriteLine("Inside");
            Console.WriteLine(paramDict["index"].GetType().ToString());
            var index = Convert.ToInt32((paramDict["index"]));
            
        }

Python script:

   clr.AddReference("System.Collections")
from System.Collections.Generic import Dictionary
from System import String
from System import Object
clr.AddReference("PyTest")
from PyTest import PyClass

class Utils(object):

    @staticmethod
    def prepare_dict(**kwargs):

        dict_net = Dictionary[String,Object]()
        for key_value in kwargs.keys():
            dict_net.Add(key_value,kwargs[key_value])
        return dict_net

parameters = {}
parameters['index'] = 1
net_dict = Utils.prepare_dict(**parameters)
obj = PyClass()
obj.DictMethod(net_dict)

Output in 3.x version:

C:\Users\Athul\Desktop>c:\Python37\python.exe pynettest.py
Inside
Python.Runtime.PyInt
Traceback (most recent call last):
  File "pynettest.py", line 50, in <module>
    obj.DictMethod(net_dict)
System.InvalidCastException: Unable to cast object of type 'Python.Runtime.PyInt' to type 'System.IConvertible'.
   at System.Convert.ToInt32(Object value)
   at PyTest.PyClass.DictMethod(Dictionary`2 paramDict) in C:\Users\Athul\source\repos\PyTest\PyClass.cs:line 46

Output in 2.x version :

C:\Users\Athul\Desktop>c:\Python37\python.exe pynettest.py
Inside
System.Int32

C:\Users\Athul\Desktop>
@filmor
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filmor commented Apr 6, 2022

This behavioural change is intentional as converting automatically to int32 (or int64, or maybe BigInteger) created too many problems (#1568). One might be able to implement IConvertible to recover your particular use-case, PRs are welcome :)

@vinaykk5

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@filmor filmor mentioned this issue Apr 10, 2022
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@filmor
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filmor commented Apr 10, 2022

@athulds Can you please check whether the version from the linked PR (#1762) works for you?

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Implement IConvertible on PyObject filmor/pythonnet
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@filmor @athulds @vinaykk5