ArcGIS Pro - Using Python Codeblock in Calculate Field 

I'm in my first python for geoprocessing class and assigning remotely-sensed invasive plant clusters to categories based on size (to budget removal). Seeing how you set things up, dealt with the python "expression," and exported your code once proofed, was very helpful. Thank you!

I really like the very straightforward way you described this. Thank you!

What if you want to use existing numbers as criteria to return text? Ie. if x=0, return « not significant »

Thanks for sharing! I'm having an issue where after I've clicked "OK" the script runs fine. But the field is not keeping the script. So whenever I go back to "Calculate Field" the script is missing. Any idea what might be causing this? Thanks!