Measuring distance to two Points in ArcPy?

Question

I would like to know how to measure the distance from two Points in ArcPy?

I know only Geometry has the distanceTo method but how do I could make a typecast in ArcPy?

I got the following error message:

---

Runtime error 
Traceback (most recent call last):
  File "<string>", line 10, in <module>
AttributeError: 'Point' object has no attribute 'distanceTo'

Here is my code:

'''

... ptIni = {}
... ptEnd = {}
... for row in arcpy.SearchCursor("polilinha"):
...     ptIni = row.Shape.firstPoint
...     ptEnd = row.Shape.lastPoint
... print ptIni.distanceTo(ptFim)

Answer 1

Use the da.SearchCursor instead of the old cursor.

To find mid point use positionAlongLine with use_percentage=True:

import arcpy
fc = 'Roads'
geom = [i[0] for i in arcpy.da.SearchCursor(fc,'SHAPE@')][0]
midpoint = geom.positionAlongLine(value=0.5, use_percentage=True)