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ExternalEvaluatorObject[…]

represents an external evaluator for use with ExternalEvaluate.

Details
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Examples  
Basic Examples  
Scope  
Properties & Relations  
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ExternalEvaluatorObject   

Listing of External Evaluators »

ExternalEvaluatorObject[…]

represents an external evaluator for use with ExternalEvaluate.

Details

  • ExternalEvaluatorObject[…][prop] returns a property of the external evaluator.
  • The following possible properties can be used:
  • "System"the external system or language to be started
    "Evaluator"the evaluator to be used
    "EvaluatorID"the evaluator id (e.g. "stik-rhuorn-114p8tb3qqb4w")
  • Available properties can be queried with ExternalEvaluatorObject[…]["Properties"].

Examples

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Basic Examples  (1)

Use ExternalEvaluators to return a list of ExternalEvaluatorObject:

Wolfram Language code: evaluators = ExternalEvaluators["Python"]

Take the first evaluator with First:

Wolfram Language code: evaluator = First[evaluators]

Query properties from an ExternalEvaluatorObject:

Wolfram Language code: evaluator["Evaluator"]

Scope  (2)

Find an evaluator:

Wolfram Language code: evaluator = First @ ExternalEvaluators["Python"]

List all possible properties:

Wolfram Language code: evaluator["Properties"]

Make a dataset of all ExternalEvaluatorObject properties:

Wolfram Language code: evaluator[All]//Dataset

Start a session:

Wolfram Language code: session = StartExternalSession["Python"]

Use "EvaluatorObject" to extract the ExternalEvaluatorObject used to start the session:

Wolfram Language code: evaluator = session["EvaluatorObject"]

Use "Evaluator" to extract the evaluator configuration it was used to start the session:

Wolfram Language code: evaluator["Evaluator"]

Properties & Relations  (3)

ExternalEvaluatorObject can be used with StartExternalSession:

Wolfram Language code: evaluator = First @ ExternalEvaluators["Shell"]
Wolfram Language code: session = StartExternalSession[evaluator]

Use ExternalEvaluate to perform evaluation:

Wolfram Language code: ExternalEvaluate[session, "date"]

Close the session:

Wolfram Language code: DeleteObject[session]

ExternalEvaluatorObject can be used with ExternalEvaluate, it will automatically start and close a session:

Wolfram Language code: evaluator = First @ ExternalEvaluators["Shell"]
Wolfram Language code: ExternalEvaluate[evaluator, "date"]

Get all external evaluators with ExternalEvaluators:

Wolfram Language code: ExternalEvaluators[]//Short

List only evaluators for a specific system:

Wolfram Language code: ExternalEvaluators["Python"]
Wolfram Research (2025), ExternalEvaluatorObject, Wolfram Language function, https://reference.wolfram.com/language/ref/ExternalEvaluatorObject.html.

Text

Wolfram Research (2025), ExternalEvaluatorObject, Wolfram Language function, https://reference.wolfram.com/language/ref/ExternalEvaluatorObject.html.

CMS

Wolfram Language. 2025. "ExternalEvaluatorObject." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/ExternalEvaluatorObject.html.

APA

Wolfram Language. (2025). ExternalEvaluatorObject. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/ExternalEvaluatorObject.html

BibTeX

@misc{reference.wolfram_2026_externalevaluatorobject, author="Wolfram Research", title="{ExternalEvaluatorObject}", year="2025", howpublished="\url{https://reference.wolfram.com/language/ref/ExternalEvaluatorObject.html}", note=[Accessed: 13-June-2026]}

BibLaTeX

@online{reference.wolfram_2026_externalevaluatorobject, organization={Wolfram Research}, title={ExternalEvaluatorObject}, year={2025}, url={https://reference.wolfram.com/language/ref/ExternalEvaluatorObject.html}, note=[Accessed: 13-June-2026]}