PlatformNotSupportedException at runtime

[tufeixp]

paths.Add(Application.streamingAssetsPath + "/Lib");
with the python lib moved to:
Assets\StreamingAssets\Lib
Unity2019.4, .net backend.

PlatformNotSupportedException: Operation is not supported on this platform.
at System.Reflection.Emit.DynamicMethod..ctor (System.String name, System.Type returnType, System.Type[] parameterTypes, System.Type owner, System.Boolean skipVisibility) [0x00006] in <1a63397e003c468ca748f87c92b15e72>:0
at Microsoft.Scripting.Interpreter.LightLambda.MakeRunDelegateCtor (System.Type delegateType) [0x001f4] in :0
at Microsoft.Scripting.Interpreter.LightLambda.GetRunDelegateCtor (System.Type delegateType) [0x00023] in :0
at Microsoft.Scripting.Interpreter.LightLambda.MakeDelegate (System.Type delegateType) [0x00000] in :0
at Microsoft.Scripting.Interpreter.LightDelegateCreator.CreateDelegate (System.Runtime.CompilerServices.StrongBox1[System.Object][] closure) [0x00047] in <adbce494b74f4c8787535955fc342591>:0 at Microsoft.Scripting.Interpreter.LightDelegateCreator.CreateDelegate () [0x00000] in <adbce494b74f4c8787535955fc342591>:0 at Microsoft.Scripting.Ast.LightExpression1[T].Compile (System.Int32 compilationThreshold) [0x0000c] in :0
at IronPython.Compiler.PythonScriptCode.CompileBody (Microsoft.Scripting.Ast.LightExpression`1[T] lambda) [0x00057] in <264a665625104e3c9b8ba1905cf1b515>:0
at IronPython.Compiler.PythonScriptCode.EnsureTarget (System.Boolean register) [0x00015] in <264a665625104e3c9b8ba1905cf1b515>:0
at IronPython.Compiler.PythonScriptCode.GetTarget (System.Boolean register) [0x00021] in <264a665625104e3c9b8ba1905cf1b515>:0
at IronPython.Compiler.PythonScriptCode.RunWorker (IronPython.Runtime.CodeContext ctx) [0x00000] in <264a665625104e3c9b8ba1905cf1b515>:0
at IronPython.Compiler.PythonScriptCode.Run (Microsoft.Scripting.Runtime.Scope scope) [0x00023] in <264a665625104e3c9b8ba1905cf1b515>:0
at IronPython.Compiler.RuntimeScriptCode.InvokeTarget (Microsoft.Scripting.Runtime.Scope scope) [0x000c6] in <264a665625104e3c9b8ba1905cf1b515>:0
at IronPython.Compiler.RuntimeScriptCode.Run (Microsoft.Scripting.Runtime.Scope scope) [0x00000] in <264a665625104e3c9b8ba1905cf1b515>:0
at Microsoft.Scripting.SourceUnit.Execute (Microsoft.Scripting.Runtime.Scope scope, Microsoft.Scripting.ErrorSink errorSink) [0x00026] in <96bae61c64314af5927380c0b6bd16cf>:0
at Microsoft.Scripting.SourceUnit.Execute (Microsoft.Scripting.Runtime.Scope scope) [0x00000] in <96bae61c64314af5927380c0b6bd16cf>:0
at Microsoft.Scripting.Hosting.ScriptSource.Execute (Microsoft.Scripting.Hosting.ScriptScope scope) [0x00017] in <96bae61c64314af5927380c0b6bd16cf>:0
at Exodrifter.UnityPython.Examples.PythonLibrary.Start () [0x00038] in E:\Study\UnityPython\Assets\Examples\PythonLibrary.cs:26

[exodrifter]

What is your target platform? From what I understand about how IronPython works (which this library depends on), it won't work on any platforms that don't support System.Reflection.Emit. You can find a detailed list of which platforms support Emit or not here, but I've included the relevant portion of this page here:

Platform (scripting backend)	Is System.Reflection.Emit supported?
Android (IL2CPP)	No
Android (Mono)	Yes
iOS (IL2CPP)	No
PlayStation 4 (IL2CPP)	No
PlayStation Vita (IL2CPP)	No
Standalone (IL2CPP)	No
Standalone (Mono)	Yes
Switch (IL2CPP)	No
Universal Windows Platform (IL2CPP)	No
Universal Windows Platform (.NET)	Yes*
WebGL (IL2CPP)	No
WiiU (Mono)	Yes
XBox One (IL2CPP)	No

* I'm not sure if UWP (.NET) is supported because the documentation states that it has the ".NET Core class libraries subset" limitation, but it doesn't state if System.Reflection.Emit is part of that subset.

[tufeixp]

Standalone (Mono) X64/32 built with windows 10 sdk 10.0.19041.1

I suggest sending me a built program to test if it can run well on my target windows pc, thanks for help.

[exodrifter]

Hmm... It looks like you need to change the API compatibility level to .NET 4.x in order for it to work after the project is built. I removed that from the requirements some time ago in 79599ab but I may have forgotten to check if that was still true after building. I'll update the README shortly.

In any case, I was able to get it to work on Windows for Unity 2019.10.4f1. Here's the sample project: python.zip

[tufeixp]

Thanks, it works with .NET 4, and now I'm think on building a scripting interface like scratch with this lib.