RegisterExternalEvaluator

registers the target for use as an external evaluator with the language or system sys.

Details

Registered evaluators can be identified using FindExternalEvaluators.
target is typically an executable file that can be used to execute code for the system sys but can also be specified as File[…].
target is typically an executable file that can be used to execute code for the system sys, but can also be specified as File[…] or DatabaseReference[…].
In RegisterExternalEvaluator[sys,target], possible choices of sys include:

	"Python"	Python
	"NodeJS"	JavaScript running through Node.js
	"Julia"	Julia
	"Ruby"	Ruby
	"R"	R
	"Jupyter"	Jupyter kernel
	"SQL"	SQL database
	"SQL-JDBC"	SQL database using JDBC

External evaluator registrations persist between Wolfram Language sessions.
RegisterExternalEvaluator returns a UUID that references this evaluator inside the dataset returned by FindExternalEvaluators.
Evaluators registered with RegisterExternalEvaluator can be unregistered with UnregisterExternalEvaluator.
RegisterExternalEvaluator encrypts and stores sensitive evaluator data such as database passwords using the system keychain.

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Define a reference to a database using SQLite:

When using ExternalEvaluate, "SQL" will use the most recently registered database:

To unregister the database, use UnregisterExternalEvaluator:

Unregister an external evaluator with UnregisterExternalEvaluator so it can be registered again:

List all current external evaluators for a system:

Unregister all external evaluators for a particular system:

All evaluators for Python are now unregistered:

All of the Python installations are now registered again:

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