def list():
option = Option(start=0, every=True)
assistant = LocalAssistant((), option)
assistant.search()
return 0
def search(keywords, target, year_low, year_high):
option = Option(start=0, year_low=year_low, year_high=year_high)
assistant = LocalAssistant(keywords, option) if target == 'local' \
else GlobalAssistant(keywords, option)
assistant.search()
return 0