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Thanks for sending over this information. In this case, after execution of the workflow, the "No valid metadata" error went away, and is actually unrelated to the actual error of no data showing up in the output anchor (even though the Jupyter Notebook says data was written to anchor #1).
Typically, I have seen this error come from updating from older versions of Alteryx to a newer one that has the Jupyter functionality (2018.3 or 2018.4). Typically the fix is to reset the settings, which you tried in this case.
I believe further investigation is necessary to determine the root cause. Can you email Alteryx Customer Support (Support@alteryx.com) and reference this thread?
The specific "No Valid Metadata" error is more or less cosmetic. The Python Tool works off a cache of your data, allowing you to interactively build your workflow. It is more or less a reminder to re-run your workflow to push the changes made to the data in the Python tool (such as new columns, etc) to your downstream tools. As long as you can see output in the proper anchors when using the Alteryx.write() function you should be good.
After speaking to Alteryx support, I did the following to resolve this.
1. Ensuring the my system setting in my designer are in place (Apparently, my errorlogs and engine logs are not created). You can reset or check you system setiing by going to Option --> Advance Option --> System Settings.
2. Running on elevated (Administrator) seems to help with the problem as well.
After these steps, I am able to see the Python in my output anchor.