Python Script Tool with validation not opening in ArcGIS Pro

Question

I am trying to figure out why my ArcGIS Pro Python Script Tool with validation fails to open when I insert the block of code in my image.

def initializeParameters(self):
    shpFile = r"C:\LPA\Data\ne_10m_admin_0_countries.shp"
    self.params[0].filter.list = sorted([row[0] for row in
arcpy.da.SearchCursor(shpFile, "NAME")])
      return

Answer 1

I think that it is the two extra spaces of indentation before your first return that is causing the problem.

Try this instead of the code that you have presented:

def initializeParameters(self):
    shpFile = r"C:\LPA\Data\ne_10m_admin_0_countries.shp"
    self.params[0].filter.list = sorted([row[0] for row in arcpy.da.SearchCursor(shpFile, "NAME")])
    return

In a comment you showed a misspelt line of code that was giving a different error:

self.params[0].filter.list = sorted( [row[0] for row in arcpy.da.SearchCursur(shpFile, "NAME")])

should have SearchCursor (not SearchCursur):

self.params[0].filter.list = sorted( [row[0] for row in arcpy.da.SearchCursur(shpFile, "NAME")])