# Python Engine CPython3 does not exist in my python node

**URL:** <https://forum.dynamobim.com/t/python-engine-cpython3-does-not-exist-in-my-python-node/86177>\
**Category:** Revit\
**Tags:** revit, python, dynamo\
**Created:** [February 15, 2023, 11:00am UTC](https://forum.dynamobim.com/t/python-engine-cpython3-does-not-exist-in-my-python-node/86177 "2023-02-15T11:00:02Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ihouzi](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/ihouzi/32/132947_2.png) [@ihouzi](https://forum.dynamobim.com/u/ihouzi)\
**Post date:** [February 15, 2023, 11:00am UTC](https://forum.dynamobim.com/t/python-engine-cpython3-does-not-exist-in-my-python-node/86177/1 "2023-02-15T11:00:02Z")

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I need your help  
I have my python script node with no engine choice. I have to specify the CPython3 engine, but I don’t know how?

 ![CPython3](https://us1.discourse-cdn.com/flex022/uploads/dynamobim/original/3X/e/a/ea6f8d4613b4e16896b36432a69c551339d14d3b.jpeg)

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**Author:** ![jacob.small](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/jacob.small/32/161030_2.png) [@jacob.small](https://forum.dynamobim.com/u/jacob.small)\
**Post date:** [February 15, 2023, 11:15am UTC](https://forum.dynamobim.com/t/python-engine-cpython3-does-not-exist-in-my-python-node/86177/2 "2023-02-15T11:15:55Z")

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Looks like you’re in an older Dynamo build. Update your host application (ie: Revit) or use a newer build of Dynamo Sandbox and you should have the option.

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**Author:** ![negigulshan903](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/negigulshan903/32/155295_2.png) [@negigulshan903](https://forum.dynamobim.com/u/negigulshan903)\
**Post date:** [February 16, 2023, 3:55pm UTC](https://forum.dynamobim.com/t/python-engine-cpython3-does-not-exist-in-my-python-node/86177/3 "2023-02-16T15:55:29Z")

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Hello this is Gulshan Negi  
Well, it’s possible that the Python installation on your system does not include the CPython3 engine, or it may not be properly configured. You must recheck it along with all the required requirements.  
Thanks

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**Author:** ![ihouzi](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/ihouzi/32/132947_2.png) [@ihouzi](https://forum.dynamobim.com/u/ihouzi)\
**Post date:** [February 16, 2023, 5:09pm UTC](https://forum.dynamobim.com/t/python-engine-cpython3-does-not-exist-in-my-python-node/86177/4 "2023-02-16T17:09:17Z")

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Hello @jacob.small i will try to update the dynamo build  
thank you for your answer