在Python中如何使用变量作为文件名的一部分？

Question

我正在创建一个Python程序，它将向我发送我最喜欢的Subreddits帖子的前十个列表。目前代码如下：

def AskReddit():
    askReddit = requests.get('http://www.reddit.com/r/AskReddit/top.json',
    headers={'user-agent':'Mozilla/5.0'},
    auth=('TadaceAce','Password'),
    )

    n = 0
    for post in askReddit.json()['data']['children']:
        x[n] = post['data']['title']
        n += 1

        if (n == 10):
            break

        output = "{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}".format(x[0],
                                                    x[1], x[2], x[3],
                                                    x[4], x[5], x[6],
                                                    x[7], x[8], x[9])

    return output

def todayILearned():
    todayilearned = requests.get('http://www.reddit.com/r/todayilearned/top.json',
    headers={'user-agent':'Mozilla/5.0'},
    auth=('TadaceAce','Password'),
    )

    n = 0
    for post in todayilearned.json()['data']['children']:
        x[n] = post['data']['title']
        n += 1

        if (n == 5):
            break

        output = "{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}".format(x[0],
                                                    x[1], x[2], x[3],
                                                    x[4], x[5], x[6],
                                                    x[7], x[8], x[9])

    return output

我正在尝试干燥代码，因为我将添加越来越多的子项，但我被这段代码卡住了：

def reddit(subreddit):
    todayilearned = requests.get('http://www.reddit.com/r/{}/top.json'.format(subreddit),
    headers={'user-agent':'Mozilla/5.0'},
    auth=('TadaceAce','Password'),
    )

    z = "%s.json" % subreddit

    n = 0
    for post in z()['data']['children']:
        x[n] = post['data']['title']
        n += 1

        if (n == 5):
            break

    output = "{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}\n{}".format(x[0],
                                                    x[1], x[2], x[3],
                                                    x[4], x[5], x[6],
                                                    x[7], x[8], x[9])

    return output

你要怎么解决这个问题？特别是for循环，因为我80%确定这就是问题所在。你知道吗

Answer 1

这里的问题是 ^方法reddit(subreddit)中的{}

z是一个字符串，您将其用作可调用对象。你知道吗

据我所知你需要做的是

z = todayilearned.json()

如果您能够从url获取数据，并且如果json具有data和children属性，并且x应该被初始化，那么这应该可以工作

Answer 2

正如我在上面的评论中提到的，你的代码似乎有点随意，我也注意到你说你得到了一个前十名列表，然后你在输出中使用了10个x元素，但是你在6之后打破了for循环。你知道吗

下面的函数应该满足您的实际要求。你知道吗

def reddit(subreddit):
    response = requests.get('http://www.reddit.com/r/{}/top.json'.format(subreddit),
    headers={'user-agent':'Mozilla/5.0'},
    auth=('TadaceAce','Password'),
    )

    count = 0
    top_ten = []
    for post in response.json()['data']['children']:
        top_ten.append(post['data']['title'])
        count += 1

        if (count == 9):
            break

    output = '\n'.join(top_ten)

    return output

调用print(reddit('AskReddit'))返回

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What is a common internet thing that you hate?
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