Traceback (most recent call last):
  File "C:UsersuwnDropboxBlenderTest.blendText", line 10, in <module>
KeyError: 'bpy_prop_collection[key]: key "Circle" not found'
Error: Python script fail, look in the console for now...

import bpy
import math
import bmesh
import csv

obj = bpy.data.objects['Circle']

if obj.mode == 'EDIT':
    bm = bmesh.from_edit_mesh(obj.data)
    for v in bm.verts:
        if v.select:
            print(v.co)
else:
    print("Object is not in edit mode")


bm = bmesh.from_edit_mesh(obj.data)

filename = 'Test.csv'

fields = ['X','Y','Z']

reader = csv.DictReader(open(filename), fields, delimiter=';')

dicts = []

next(reader)
for row in reader:
    dicts.append(row)

for row in dicts:
    xpos = float(row['X'])/100.0
    ypos = float(row['Y'])/100.0
    zpos = float(row['Z'])/100.0
    bm.verts.new((xpos,ypos,zpos))

bmesh.update_edit_mesh(obj.data)