>>> import arcpy
>>> points = []
>>> for row in arcpy.da.SearchCursor("YourInputLinesFileHere", ["SHAPE@"]):
...     length = row[0].length
...     for i in range(0,6):
...         point = row[0].positionAlongLine(length/5*i)
...         points.append(point)
>>> arcpy.CopyFeatures_management(points, 'YourOutputPointsFileHere')