ArcGIS10.1 python 提取面的所有拐点坐标到属性字段中

def MySub(feat):    

 partnum = 0

 #multipart feature

 partcount = feat.partCount

 pntcount = 0

 str=''

 # Enter while loop for each part in the feature (if a singlepart feature

 # this will occur only once)

 while partnum < partcount:

  part = feat.getPart(partnum)

  pnt = part.next()

  # Enter while loop for each vertex

  #

  str=str+"["

  while pnt:

   pntcount += 1

   px='%f' %pnt.x

   py='%f' %pnt.y

   str=str+px+","+py +";"

   pnt = part.next()

   

   # If pnt is null, either the part is finished or there is an 

   # interior ring

   if not pnt:

    str=str[:-1]

    str=str+"]" 

    pnt = part.next()

  partnum += 1

 return str