How to compile an actor BP in python?

Development Pipeline & Plugins Editor Scripting
4

It’s easy if you are using UE5, there is a new editor bp lib: BlueprintEditorLibrary

    @classmethod
    def compile_blueprint(cls, blueprint):
        r"""
        X.compile_blueprint(blueprint) -> None
        Compiles the given blueprint.
        
        Args:
            blueprint (Blueprint): Blueprint to compile
        """
        return None

just call it:

unreal.BlueprintEditorLibrary.compile_blueprint(your_bp)

If in UE4, the “compile” function is not callable from python, but you can wrap and make it blueprint callable in your UBlueprintFunctionLibrary, just like BlueprintEditorLibrary.h did

.h

	/**
	* Compiles the given blueprint. 
	*
	* @param Blueprint	Blueprint to compile
	*/
	UFUNCTION(BlueprintCallable, Category = "Blueprint Upgrade Tools")
	static void CompileBlueprint(UBlueprint* Blueprint);

.cpp

void UBlueprintEditorLibrary::CompileBlueprint(UBlueprint* Blueprint)
{
	if (Blueprint)
	{
		// Skip saving this to avoid possible tautologies when saving and allow the user to manually save
		EBlueprintCompileOptions Flags = EBlueprintCompileOptions::SkipSave;
		FKismetEditorUtilities::CompileBlueprint(Blueprint, Flags);
	}
}
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