code: def convert_bytes(bytes_, K=1 << 10, M=1 << 20, G=1 << 30, T=1 << 40):
      
      fn = float(bytes_)
      if bytes_ >= T:
          return '%.1fT' % (fn / T)
      elif bytes_ >= G:
          return '%.1fG' % (fn / G)
      elif bytes_ >= M:
          return '%.1fM' % (fn / M)
      elif bytes_ >= K:
          return '%.1fK' % (fn / K)
      else:
          return '%d' % bytes_
docs: Converts a number of bytes to a shorter, more human friendly format