UnregisterExternalEvaluator [sys,evaluator]
unregisters the external evaluator referenced by evaluator for system sys so that it is not used by ExternalEvaluate and related functions.
UnregisterExternalEvaluator
Listing of External Evaluators »UnregisterExternalEvaluator [sys,evaluator]
unregisters the external evaluator referenced by evaluator for system sys so that it is not used by ExternalEvaluate and related functions.
Details
- UnregisterExternalEvaluator [sys,evaluator] effectively blocks the external evaluator referenced by evaluator from being used by ExternalEvaluate .
- evaluator 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 UnregisterExternalEvaluator [sys,…], possible choices of sys include:
-
"Python" Python"NodeJS" JavaScript running through Node.js"Julia" Julia"Ruby" Ruby"R" R"Shell" Bash, Sh, Zsh, ..."Jupyter" Jupyter kernel"SQL" SQL database"SQL-JDBC" SQL database using JDBC
Examples
Basic Examples (1)
Define a reference to a database using SQLite:
Register the database using RegisterExternalEvaluator :
When using ExternalEvaluate , "SQL" will use the most recently registered database:
Unregister the database:
After unregister the database ExternalEvaluate will fallback to the default database which is empty:
Related Guides
Related Workflows
Text
Wolfram Research (2017), UnregisterExternalEvaluator, Wolfram Language function, https://reference.wolfram.com/language/ref/UnregisterExternalEvaluator.html (updated 2020).
CMS
Wolfram Language. 2017. "UnregisterExternalEvaluator." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2020. https://reference.wolfram.com/language/ref/UnregisterExternalEvaluator.html.
APA
Wolfram Language. (2017). UnregisterExternalEvaluator. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/UnregisterExternalEvaluator.html
BibTeX
@misc{reference.wolfram_2025_unregisterexternalevaluator, author="Wolfram Research", title="{UnregisterExternalEvaluator}", year="2020", howpublished="\url{https://reference.wolfram.com/language/ref/UnregisterExternalEvaluator.html}", note=[Accessed: 09-January-2026]}
BibLaTeX
@online{reference.wolfram_2025_unregisterexternalevaluator, organization={Wolfram Research}, title={UnregisterExternalEvaluator}, year={2020}, url={https://reference.wolfram.com/language/ref/UnregisterExternalEvaluator.html}, note=[Accessed: 09-January-2026]}