code: def get(self, key):
          
  
          value = self._results.get(key)
          if value is not None:
              return value
  
          # get from option default value
          option = list(filter(lambda o: o.key == key, self._option_list))
          if not option:
              raise ValueError('No such option: %s' % key)
  
          option = option[0]
          return option.default
docs: Get parsed result.
  
          After :func:`parse` the argv, we can get the parsed results::
  
              # command.option('-f', 'description of -f')
              command.get('-f')
  
              command.get('verbose')
              # we can also get ``verbose``: command.verbose