Looping if condition using ArcPy?

Question

I'm working with Arcgis 10.1, i'm trying to loop if condition on Python code, but they give me as error :

Parsing error IndentationError: unexpected indent (line 18)

I don't know what is going wrong.

This is the code.

import arcpy
import math
arcpy.AddField_management("Parcelles_class_FeatureToPoi3","new_field","DOUBLE")
cur = arcpy.UpdateCursor("Parcelles_class_FeatureToPoi3") 
 for row in cur:
... PointX = row.getValue("POINT_X")
... print PointX
... PointY = row.getValue("POINT_Y")
... print PointY
... EndX = row.getValue("end_x")
... print EndX
... EndY = row.getValue("end_y")
... print EndY
... dx = EndX - PointX 
... dy = EndY - PointY 
... azimuth = math.atan2(dy, dx)
... print azimuth
... azimuth_gr = azimuth*200/3.14519
... print azimuth_gr
 if (dy>=0 and dx>= 0 ):
... azimuth_fi = azimuth_gr
... else : 
... if (dy>=0 and dx<= 0 ):
... azimuth_fi = 200- azimuth_gr
... else :
... if (dy<=0 and dx<= 0 ):
... azimuth_fi = 200 + azimuth_gr
... else :
... if (dy<=0 and dx>= 0 ):
... azimuth_fi = 400 - azimuth_gr
... print azimuth_fi
 row.setValue("new_field", azimuth_fi)
 cur.updateRow(row)

• PolyGeo: I think the problem is that your else: and the lines in that code block need to be dedented one level to line up with the preceding if:. However, it is hard to be certain with those three dots at the beginning of many lines which I think are an artefact of a copy/ paste from ArcMap's Python window.
• geosevda: Is there an other way to compile this code on arcgis without using Python window ?!
• PolyGeo: I use IDLE which is installed with ArcGIS for Desktop for most of my Python work but I use the Python window for quick tests.
• Erica: PolyGeo is correct, all the else conditions needs to line up with their respective if conditions. And I'd also recommend IDLE for coding, with a quick copy-paste into the Python window to execute.
• PolyGeo: You'll find IDLE on the Windows Start Menu under ArcGIS and then Python2.7

Answer 1

It would be much clearer with elif then with else: if: . Not that you could also group your condiftion with hierachical if (first test dy, then test dx =>you make 2 tests instead of up to 4 tests)

... print azimuth_gr
 if (dy>=0 and dx>= 0 ): #if should be aligned with print
 azimuth_fi = azimuth_gr
 elif (dy>=0 and dx<= 0 ):
 azimuth_fi = 200- azimuth_gr
 elif (dy<=0 and dx<= 0 ):
 azimuth_fi = 200 + azimuth_gr
 else:
 azimuth_fi = 400 - azimuth_gr
 print azimuth_fi
 row.setValue("new_field", azimuth_fi) #these line should also be aligned, otherwise you only update the last row
 cur.updateRow(row)
 del(row, cur)