Can´t import Arcpy on ArcGIS 10.2

Hi.
I simply don´t get Arcpy to import! Command line import arcpy produdes this Traceback:

File "C:/Daten/Untersuchungsgebiete/test.py", line 1, in <module>
import arcpy
File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\__init__.py", line 21, in <module>
from arcpy.geoprocessing import gp
File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\geoprocessing\__init__.py", line 14, in <module>
from _base import *
File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\geoprocessing\_base.py", line 592, in <module>
env = GPEnvironments(gp)
File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\geoprocessing\_base.py", line 589, in GPEnvironments
return GPEnvironment(geoprocessor)
File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\geoprocessing\_base.py", line 545, in __init__
self._refresh()
File "C:\Program Files (x86)\ArcGIS\Desktop10.2\arcpy\arcpy\geoprocessing\_base.py", line 547, in _refresh
envset = (set(env for env in self._gp.listEnvironments()))
RuntimeError: NotInitialized

Any ideas to fix the problem?
Regards