code: def harmonicmean(inlist):
      
      sum = 0
      for item in inlist:
          sum = sum + 1.0 / item
      return len(inlist) / sum
docs: Calculates the harmonic mean of the values in the passed list.
  That is:  n / (1/x1 + 1/x2 + ... + 1/xn).  Assumes a '1D' list.
  
  Usage:   lharmonicmean(inlist)