The current version of Data360 Analyze leverages the Python 2 language.
We are exploring options to allow a future release of Analyze to leverage a 'Bring Your Own Python3' installation. However, this is not a committed roadmap item at this time.
If you are using a Linux server instance you may be able to use a Transform node to execute an external Python 3 script, for example adapting the following code:
import os
os.system("/path/to/python3 /path/to/your/script.py -whateverparameter")
If you needed to read back results you could use the os.popen() function instead.
While the above does not execute the Python 3 script within Analyze, it does permit Analyze to orchestrate the execution of a Python 3 script within the context of an Analyze data flow.