code: def set_APSR_flag_to_value(self, flag, value):
          
          if flag == 'N':
              bit = 31
          elif flag == 'Z':
              bit = 30
          elif flag == 'C':
              bit = 29
          elif flag == 'V':
              bit = 28
          else:
              raise AttributeError("Flag {} does not exist in the APSR".format(flag))
  
          if value:
              self.register['APSR'] |= (1 << bit)
          else:
              self.register['APSR'] -= (1 << bit) if (self.register['APSR'] & (1 << bit)) else 0
docs: Set or clear flag in ASPR
          :param flag: The flag to set
          :param value: If value evaulates to true, it is set, cleared otherwise
          :return: