text: # -*- coding:utf-8 *-*
  def cMax(x,y):
      z =max(x,y)
      return z
  def cMin(x,y):
      z =min(x,y)
      return z
  def cPelace1(x,y):
      if x==1.0:
          z =y
      else :
          z =x
      return z
  def ariMean(x,y):
      z = (x + y)/2
      return  z
  def geoMean(x,y):
      import math
      z =math.sqrt(x*y)
      return  z
  if __name__=='__main__':
      print 'hello world.'
      z =geoMean(3,6)
      print z