devlist = ['SARUN01',  'SARUN02',  'SARUN03',  'SARUN04',  'SARUN05', \
           'SARUN06',  'SARUN07',  'SARUN08',  'SARUN09',  'SARUN10', \
           'SARUN11',  'SARUN12',  'SARUN13',  'SARUN14',  'SARUN15']#\
#           'SARUN16'  'SARUN17'  'SARUN18'  'SARUN19'  'SARUN20' ]
last_offset = -0.020
devlist = devlist[10:]
for i,dev in enumerate(devlist):
#  def func (off_last):
#    return 
  off_x = caget(dev + "-DBPM070:OFFS-X")
  off_y = caget(dev + "-DBPM070:OFFS-Y")
  off_x = off_x + last_offset*i/(len(devlist)-1)
  off_y = off_y + 0.000
  caput(dev + "-DBPM070:OFFS-X", float(off_x))
  #caput(dev + "-DBPM070:OFFS-Y", float(off_y))
  print('off_x: ', off_x)
  print('dev: ', dev)