previous_article?=?all_article[previous_index]
next_article?=?all_article[next_index]

這兩句上哪去了

def?get_detail_page(request,?article_id):
????all_article?=?Article.objects.all()
????curr_article?=?None
????previous_article?=?None
????next_article?=?None
????for?index,?article?in?enumerate(all_article):
????????if?index?==?0:
????????????previous_index?=?0
????????????next_index?=?index?+?1
????????elif?index?==?len(all_article)?-?1:
????????????previous_index?=?index?-?1
????????????next_index?=?index
????????else:
????????????previous_index?=?index?-?1
????????????next_index?=?index?+?1
????????previous_article?=?all_article[previous_index]
????????next_article?=?all_article[next_index]
????????if?article.article_id?==?article_id:
????????????curr_article?=?article
????????????break
????section_list?=?curr_article.content.split('\n')
????return?render(request,?'blog/detail.html',?{
????????'curr_article':?curr_article,
????????'section_list':?section_list,
????????'previous_article':?previous_article,
????????'next_article':?next_article
????})

我是這樣的