How to bypass raise Error in if else statement

LoriEmersonKDOT — Thu, 09 Jul 2026 20:02:30 GMT

Why does my arcpy code raise an error even though the if/else statement says to bypass it? For example, why does the raise RouteError still happen when if row[3] == "NO ERROR" is true?

class RouteError(Exception): pass import arcpy import sys arcpy.env.overwriteOutput = True def CalcPavementArea_tool(in_FC, in_RouteIdx, in_Workspace, in_LRS, out_Poly_Area): try: # ------------------------------------------- # Define workspace using input paramter value # ------------------------------------------- arcpy.env.workspace = in_Workspace my_RouteID_FromTo_Measures_Table = in_Workspace + "\\input_RouteId_FromTo_Measures" # --------------------------------------------------------- # Update table with user's RouteId,, From, and To Measures # --------------------------------------------------------- fields_inputRoute = ['RouteId', 'FromMeasure', 'ToMeasure'] with arcpy.da.UpdateCursor(my_RouteID_FromTo_Measures_Table, fields_inputRoute) as cursor: for row in cursor: #Update RouteId, FromMeasure, ToMeasure values row[0] = in_RouteId row[1] = in_FromMeasure row[2] = in_ToMeasure cursor.updateRow(row) arcpy.AddMessage("Update to RouteId=" + in_RouteId + ", FromMeasure=" + in_FromMeasure + ", ToMeasure=" + in_ToMeasure + " input table completed successfully") # --------------------------------------------------------- # Make Route Event from LRS_County and User's input # --------------------------------------------------------- # Make Route Event Layer (Make Route Event Layer) -- from input RouteId, and From/To measure output_RouteId_FromToMeasures_Events = "input_RouteId_FromToMeasures Events" arcpy.lr.MakeRouteEventLayer( in_routes=in_LRS, route_id_field="RouteId", in_table=my_RouteID_FromTo_Measures_Table, in_event_properties="RouteId; LINE; FromMeasure; ToMeasure", out_layer=output_RouteId_FromToMeasures_Events, add_error_field="ERROR_FIELD", add_angle_field="NO_ANGLE_FIELD", angle_type="NORMAL", complement_angle="ANGLE", offset_direction="LEFT", point_event_type="POINT") arcpy.AddMessage("Make Route Event Layer completed successfully") # --------------------------------------------------------- # Verify Route Results -- LOC_ERROR # --------------------------------------------------------- myEventFields = ["RouteId", "FromMeasure", "ToMeasure", "LOC_ERROR"] with arcpy.da.SearchCursor("input_RouteId_FromToMeasures Events", myEventFields) as srchCursor: for row in srchCursor: if row[3] == "No Error": arcpy.AddMessage("RouteId=" + str(row[0]) + ": FromMeasure=" + str(row[1]) + " ToMeasure=" + str(row[2]) + " are valid.") else: if row[3] == "Measure Extent Out Of Route Measure Range": arcpy.AddWarning("Measure Extent Out Of Route Measure Range. RouteId=" + str(row[0]) + ": FromMeasure=" + str(row[1]) + " ToMeasure=" + str(row[2])) else: arcpy.AddError(row[3] + ". RouteId=" + str(row[0]) + ": FromMeasure=" + str(row[1]) + " ToMeasure=" + str(row[2])) raise RouteError # --------------------------------------------------------- # Export the Route Event to a Feature Class # --------------------------------------------------------- arcpy.conversion.ExportFeatures( output_RouteId_FromToMeasures_Events, out_features=in_Workspace + r"\RouteId_FromToMeasures_Events", use_field_alias_as_name="NOT_USE_ALIAS", field_mapping=None ) arcpy.AddMessage(in_Workspace + r"\RouteId_FromToMeasures_Events" + " EXPORT completed successfully") return except RouteError: arcpy.AddMessage("Script ended unsuccessfully") except arcpy.ExecuteError: arcpy.AddMessage(arcpy.GetMessages(2)) except Exception as e: print("Other error:", e) if __name__ == "__main__": ## ------------------------------------------------------- ## Grab parameter values and pass to our tool ## ------------------------------------------------------- in_FC = arcpy.GetParameterAsText(0) # -- feature class in_LRS = arcpy.GetParameterAsText(1) # -- LRS in_RouteIdx = arcpy.GetParameterAsText(2) # -- RouteId in_FromMeasure = arcpy.GetParameterAsText(3) in_ToMeasure = arcpy.GetParameterAsText(4) in_Workspace = arcpy.GetParameterAsText(5) # -- workspace out_Poly_Area = arcpy.GetParameterAsText(6) # -- output polygon arcpy.AddMessage(in_RouteIdx) arcpy.AddMessage(in_FromMeasure) arcpy.AddMessage(in_ToMeasure) CalcPavementArea_tool(in_FC, in_RouteIdx, in_Workspace, in_LRS, out_Poly_Area) #arcpy.SetParameterAsText(2, "Result") # -- Output polygon with paved surface area

Re: How to bypass raise Error in if else statement

RichardDaniels — Fri, 10 Jul 2026 00:22:10 GMT

do you want the 'except' blocks to flow like that or, if there is an exception, do you want to show the appropriate message and then 'break' out of the try block? Along the lines of:

except ZeroDivisionError:

# Handle division by zero

print("Error: Cannot divide by zero.")

return None # You could also raise an exception here

Re: How to bypass raise Error in if else statement

JoshuaBixby — Fri, 10 Jul 2026 12:28:34 GMT

Beyond Richard's questions, Python string comparisons are case sensitive. I noticed your code block shows

if row[3] == "No Error"

but your question states, "row[3] == "NO ERROR". Also, extra space padding in the string can cause an issue.

topic Re: How to bypass raise Error in if else statement in ArcGIS Pro Questions

How to bypass raise Error in if else statement

Re: How to bypass raise Error in if else statement

Re: How to bypass raise Error in if else statement