8000 F# records are not accesssible if generic and inside a module · Issue #574 · pythonnet/pythonnet · GitHub
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F# records are not accesssible if generic and inside a module #574

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stevehv opened this issue Nov 18, 2017 · 9 comments
Open

F# records are not accesssible if generic and inside a module #574

stevehv opened this issue Nov 18, 2017 · 9 comments

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@stevehv
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stevehv commented Nov 18, 2017 •
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Environment

  • Pythonnet version: 2.3.0
  • Python version: 3.5.3
  • Operating System: Windows 10
  • F# 4.4.1.0, .NET Framework 4.7

Details

F# records are not accessible in pythonnet if generic AND inside a module.
Sample F# code, all types but MyRecordD are accessible from Pythonnet:

namespace MyNamespace

type MyRecordA = { a: int; b: int }
type MyRecordB<'t> = { a: 't; b: 't }

module MyModule = 
    type MyRecordC = { a: int; b: int }
    type MyRecordD<'t> = { a: 't; b: 't }

Python code, ony the last line causes an error:

from clr import MyNamespace
MyNamespace.MyRecordA                             # Ok
MyNamespace.MyRecordB[System.String]          # Ok
MyNamespace.MyModule.MyRecordC                    # Ok
MyNamespace.MyModule.MyRecordD[System.String] # AttributeError: type object 'MyModule' has no attribute 'MyRecordD'

I noticed that dir(MyNamespace) contains 'MyRecordA', 'MyRecordB', 'MyRecordB`1' while dir(MyNamespace.MyModule) only contains 'MyRecordC', 'MyRecordD`1' but no 'MyRecordD'.
@den-run-ai
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Can you show your F# version and the code for MyRecord?
Did you try accessing this F# type via System.Reflection in Python?

@den-run-ai
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Or using getattr

@dmitriyse
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Your clr.MyNamespace.MyRecord is generic with one argument, that's why CLR shows `1

@den-run-ai
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den-run-ai commented Nov 18, 2017 •
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@stevehv also what happens when you try accessing your F# record without clr.? That should not be required for .NET namespaces imported properly through pythonnet - they should act like normal Python namespaces.

@stevehv
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stevehv commented Nov 19, 2017 •
edited
L 8000 oading

Owing to some sleep deprivation the problematic F# code was not what I originally thought it was.
I have updated the original issue so that it is now reproducible, apologies for any confusion.

Accessing without clr. did not make a difference.
getattr did not work either:

getattr(MyNamespace.MyModule, 'MyRecordD`1')[System.String] # TypeError: no type matches params

@den-run-ai
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Can you show output of MyNamespace.MyModule.MyRecordD.Overloads?

@stevehv
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stevehv commented Nov 19, 2017 •
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MyNamespace.MyModule.MyRecordD.Overloads
AttributeError: type object 'MyModule' has no attribute 'MyRecordD'

System.Reflection dll.GetType("MyNamespace.MyModule+MyRecordD`1")) seems to work ok, but doing every function call using reflection makes code unreadable.

@stevehv stevehv changed the title F# record MyRecord becomes MyRecord`1 in pythonnet F# record not accesssible if generic and inside a module Nov 20, 2017
@stevehv stevehv changed the title F# record not accesssible if generic and inside a module F# records are not accesssible if generic and inside a module Nov 20, 2017
@den-run-ai
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8BBB

@stevehv any idea how this F# code looks like in C#? i'm not sure if this is only IL feature or available in C# too?

@den-run-ai den-run-ai mentioned this issue Dec 5, 2017
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@lostmsu
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lostmsu commented Sep 17, 2022

This should be added to #1374

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@lostmsu @den-run-ai @dmitriyse @stevehv
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