code: def format_duration(minutes, human = True):
      
  
      if isinstance(minutes, dt.timedelta):
          minutes = duration_minutes(minutes)
  
      if not minutes:
          if human:
              return ""
          else:
              return "00:00"
  
      if minutes < 0:
          # format_duration did not work for negative values anyway
          # return a warning
          return "NEGATIVE"
  
      hours = minutes / 60
      minutes = minutes % 60
      formatted_duration = ""
  
      if human:
          if minutes % 60 == 0:
              # duration in round hours
              formatted_duration += ("%dh") % (hours)
          elif hours == 0:
              # duration less than hour
              formatted_duration += ("%dmin") % (minutes % 60.0)
          else:
              # x hours, y minutes
              formatted_duration += ("%dh %dmin") % (hours, minutes % 60)
      else:
          formatted_duration += "%02d:%02d" % (hours, minutes)
  
  
      return formatted_duration
docs: formats duration in a human readable format.
      accepts either minutes or timedelta