如何從網頁中的標籤內的字典中獲取信息？

例如，這個標籤有字典裏本身：如何從網頁中的標籤內的字典中獲取信息？

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我想從這個字典中的一些信息（URL值從「url_enconded_fmt_stream_map」鍵）。但我不知道該怎麼做，儘管我已經搜索了很多。

編輯

標籤不完整的，我不知道爲什麼（我直接從網站（YouTube）的複製它）。

繼亞歷克斯大廳的代碼有了一些變化，我得到了這樣的結果：

代碼：

with open('script.txt') as infile: 
    for _, __, obj in jsonfinder(infile.read(), json_only=True): 
     print(obj)

輸出：

{} 
{'allowfullscreen': 'true', 'bgcolor': '#000000', 'allowscriptaccess': 'always'} 
{'player_fallback': ['É necessário usar um navegador com Adobe Flash Player ou HTML5 para reproduzir o vídeo. <a href="https://get.adobe.com/flashplayer/">Faça o download do Flash Player mais recente</a><a href="/html5">Saiba mais sobre como atualizar para um navegador com HTML5</a>']}

但即使搜索 '的allowFullScreen' 鍵，返回一個KeyError。

來源

2016-11-18 Eduardo M

它給出了一個KeyError，因爲它也提取了'{}'，正如你所看到的那樣，它沒有這個鍵。這就是爲什麼我的代碼有一個嘗試/除了。無論如何，這是我縮短了腳本的結果，所以我縮短了它有一個完整的JSON對象。現在只能找到內部對象。你必須解決你如何獲得源代碼。 –

@AlexHall，是的，它現在與try/except一起工作。關於源代碼，我不知道如何獲取完整的JSON對象，因爲它完全如何顯示網站。但是它的另一個問題。你的解決方案解決了信息攫取問題，所以我選擇了你的答案是正確的;） –

嘗試下載包含請求或硒的HTML。 –

該值以JSON編碼，因此可以用庫jsonfinder（例如，像這樣：

from jsonfinder import jsonfinder 

with open('script.txt') as infile: 
    for _, __, obj in jsonfinder(infile.read(), json_only=True): 
     try: 
      print(obj['args']['url_encoded_fmt_stream_map']) 
     except KeyError: 
      pass

來源

2016-11-18 22:39:24

不幸的是它沒有工作。我創建了一個包含標籤內容的文本文件，並使用與您編寫的代碼完全相同的代碼。沒有數據被退回 –

@EduardoM你確定你複製了標籤的全部內容？例如，你在上面的問題中粘貼的內容不完整（它以'... ...結尾），所以它不起作用。 –

我注意到這個問題，並會報告，但即使如此它不會返回在obj中的鍵的值。我用obj的輸出更新了我原來的帖子。 –

如何從網頁中的標籤內的字典中獲取信息？

回答

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