code: def startswith(self, name: str) -> List[str]:
          
          return sorted(keyword for keyword in self if keyword.startswith(name))
docs: Return a list of all keywords starting with the given string.
  
          >>> from hydpy.core.devicetools import Keywords
          >>> keywords = Keywords('first_keyword', 'second_keyword',
          ...                     'keyword_3', 'keyword_4',
          ...                     'keyboard')
          >>> keywords.startswith('keyword')
          ['keyword_3', 'keyword_4']