I am new to ArcPy.
I have an attribute table with the following columns and fields
I want to fill up the column Combined as follows: If number contains 2 categories, "combined" will be A,B.
If number contains only one then this will be pasted to "combined" column.
For example in this case first 4 rows of "Combined" will be A,B Then 5555 is the same category so only A etc..
Update cursor uses only the same row so I cannot find a way to do this.