import maya.cmds
import maya.mel as mel

def SetFPS(fps):
    unit = 'ntscf'
    if fps == 15:
        unit = 'game'
    elif fps == 24:
        unit = 'film'
    elif fps == 25:
        unit = 'pal'
    elif fps == 30:
        unit = 'ntsc'
    elif fps == 48:
        unit = 'show'
    elif fps == 50:
        unit = 'palf'
    elif fps == 60:
        unit = 'ntscf'
    else:
        unit = str(fps)+'fps'

    cmds.currentUnit( time=unit )
    fps = mel.eval('currentTimeUnitToFPS')
    print fps

SetFPS(15)
SetFPS(24)
SetFPS(25)
SetFPS(30)
SetFPS(48)
SetFPS(50)
SetFPS(60)
SetFPS(250)