用Python进行列表操作

Question

我有一个巨大的JSON文件，包含文章的标题和主体，如下所示。你知道吗

{
    "paragraphs": [
        "Ismael Omar Guelleh, known in Djibouti by his initials, IOG, won a second term in a one-man presidential race in 2005 and a third term in April 2011.", 
        "Parliament - which does not include any representatives of the opposition - approved an amendment to the constitution in 2010 allowing the president to run for a third term.", 
        "The constitutional reforms also cut the presidential mandate to five years from six, and created a senate.", 
        "Mr Guelleh succeeded his uncle and Djibouti's first president, Hassan Gouled Aptidon, in April 1999 at the age of 52. He was elected in a multi-party ballot.", 
        "Mr Guelleh supports Djibouti's traditionally strong ties with France and has tried to reconcile the different factions in neighbouring Somalia."
    ], 
    "description": "A profile of Djibouti's political leader, President Guelleh", 
    "title": "Djibouti profile"
},

我想做的是，每当我把一个标题和它对应的段落附加到一个列表中时，我想包括那些有四个或更多段落的标题（例如，我上面发布的例子有5个，所以我想包括它）。我尝试打印段落长度：

print len(y['paragraphs']

它可以工作，但我不能用它来控制将要附加的内容。你知道吗

我在Python中使用以下代码：

titles = []
vocabulary = []
paragraphs = []

with open("/Users/.../file.json") as j:
data = json.load(j)


for x in range(0,len(data)):
    titles.append(data[x]['title'])
    paragraphs.append(data[x]['paragraphs'])

for y in range(3000, 3500):
   # here I believe there must be an if statement
    vocabulary.append(titles[y])
    vocabulary.append(paragraphs[y][0])
    vocabulary.append(paragraphs[y+1][0])

我尝试在第二个后面添加if语句，例如：

if len(y['paragraphs']) > 4:

我有个错误： TypeError:“int”对象没有属性“getitem”

我知道解决方案是一个简单的一行代码，但我卡住了。有什么想法吗？你知道吗

谢谢！你知道吗

Answer 1

在for循环中定义y

for y in range(3000, 3500):

这意味着y将采用3000，3001。。。3499。这些都是int的值。因此，下面这行试图在一个明显不存在的int上使用dict查找（.getitem）。你知道吗

if len(y['paragraphs']) > 4:

Answer 2

我们需要的是：

for y in range(3000, 3500):
    length = len(paragraphs[y])
    if length > 4:
    ...