code: def graph_format(new_mem, old_mem, is_firstiteration=True):
      
      if is_firstiteration:
          output = "  n/a   "
      elif new_mem - old_mem > 50000000:
          output = "   +++++"
      elif new_mem - old_mem > 20000000:
          output = "   ++++ "
      elif new_mem - old_mem > 5000000:
          output = "   +++  "
      elif new_mem - old_mem > 1000000:
          output = "   ++   "
      elif new_mem - old_mem > 50000:
          output = "   +    "
      elif old_mem - new_mem > 10000000:
          output = "---     "
      elif old_mem - new_mem > 2000000:
          output = " --     "
      elif old_mem - new_mem > 100000:
          output = "  -     "
      else:
          output = "        "
      return output
docs: Show changes graphically in memory consumption