An OH3 beginner who wants to write rules

[Mr-JR (James R)]

@rlkoshak

With few exceptions anything written about OH 2 will apply to OH 3. There are a few minor breaking changes that you’ll have to account for when looking at examples:

• any time you see “org.eclipse.smarthome” that has been renamed to “org.openhab”
• Joda DateTime has been replaced with ZonedDateTime
• the arguments to executeCommandLine have changed

If you are looking to use Python for your rules, there is an add-on to install instead of the more complicated process you may have seen before.

Thanks Rich … yes also found this post: Ivan’s Helper Libraries - OH3, Python, JavaScript which is very helpful.

I am making some progress … but I am getting this error:
2021-04-30 10:00:07.479 [ERROR] [ipt.internal.ScriptEngineManagerImpl] - Error during evaluation of script 'file:/etc/openhab/automation/jsr223/python/personal/hello_world.py': ImportError: No module named joda in <script> at line number 6

Line 5/6 are:

from core.rules import rule
from core.triggers import when

I believe this is related to your comment about about:

any time you see “org.eclipse.smarthome” that has been renamed to “org.openhab”`

… obviously my installation is not correct, and of course you dont know what i’ve done, but curious if this rings any bells?