code: def has_option(self, option):
          
          if len(self.options) == 0:
              return False
          for op in self.options:
              if (self._sized_op and op[0] == option) or (op == option):
                  return True
          return False
docs: Return True if the option is included in this key.
  
          Parameters
          ----------
          option : str
              The option.
  
          Returns
          -------
          has : bool
              True if the option can be found. Otherwise False will be returned.