How can I say in ArcGIS Pro if the field (String) is Null, then replace it with "No"?

I was trying this:


No error occurred, but the null values did not change...


If you are working in a gdb file you can use these commands in a python window even without starting an edit session:

>>> with arcpy.da.UpdateCursor ("layer", 'database_field', 'database_field IS NULL') as uc:
...     for row in uc:
...         row[0] = 'No'
...         uc.updateRow (row)

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