def CellSize(fc):
    cs = None
    mx = max(arcpy.Describe(fc).extent.height,arcpy.Describe(fc).extent.width)
    cs = mx/2000.0
    return cs
get 2000th of the larger of height or width of extent
dataset/ETHPy150Open Esri/solutions-geoprocessing-toolbox/suitability/test/test_maot/TestModelLocalPeaks.py/CellSize