code: def to_str(number):
      
      states = globals()
      for name, value in states.items():
          if number == value and name.isalpha() and name.isupper():
              return name
      return '(unknown state %d)' % number
docs: Convert a task state ID number to a string.
  
      :param int number: task state ID, eg. 1
      :returns: state name like eg. "OPEN", or "(unknown)" if we don't know the
                name of this task state ID number.