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Unable to find an entry point named 'PyNumber_Divide' when trying to call an overridden division operator #802
Description
Environment
- Pythonnet version: 2.3
- Python version: 3.6.6
- Operating System: Windows 10 x64
Details
I was trying to dynamically call overridden division operator:
dynamic tf = Py.Import("tensorflow");
var c = tf.constant(42, tf.float32) / 2;Traceback:
System.EntryPointNotFoundException: 'Unable to find an entry point named 'PyNumber_Divide' in DLL 'python36'.' at Python.Runtime.Runtime.PyNumber_Divide(IntPtr o1, IntPtr o2) at Python.Runtime.PyObject.TryBinaryOperation(BinaryOperationBinder binder, Object arg, Object& result) at CallSite.Target(Closure , CallSite , Object , Int32 ) at System.Dynamic.UpdateDelegates.UpdateAndExecute2[T0,T1,TRet](CallSite site, T0 arg0, T1 arg1)
It works for + 2 in place of / 2, but might affect other operators too.
Workaround
The workaround is to do .__div__(2) instead of / 2
Activity
den-run-ai commented on Jan 16, 2019
@lostmsu there are some other funny things with dynamic - see #86. Can you make sure that this is reproducible without using dynamic in pythonnet?
lostmsu commented on Jan 17, 2019
@denfromufa I don't think #86 is directly related. The fact that PyNumber_Divide wrapper exists already seems to be an issue on its own.
Existence of #86 just indicates TryBinaryOperation is very incomplete.
den-run-ai commented on Jan 17, 2019
den-run-ai commented on Jan 17, 2019
@lostmsu the issue is that python 3 does not have this method, it is only in Python 2:
https://docs.python.org/2/c-api/number.html#c.PyNumber_Divide
Instead probably this one should be used:
https://docs.python.org/3/c-api/number.html#c.PyNumber_TrueDivide
Let me know if you like to submit a PR?
lostmsu commented on Jan 17, 2019
@denfromufa I might get to work on this, but not soon enough :(
filmor commented on Jan 18, 2019
Ooh, this is a nasty issue, I'll look into it.
Switch to using TrueDivide instead of Divide everywhere
Switch to using TrueDivide instead of Divide everywhere
Switch to using TrueDivide instead of Divide everywhere