使用Python請求庫獲取標頭

Question

我正在使用Python請求庫來獲取html頁面的標題並使用它來獲取編碼。 但是請求無法獲得標題的一些鏈接。 對於這種情況，我想使用編碼“utf-8”。 我該如何處理這類案件？ 如何處理requests.head返回的錯誤。

這是我的代碼：

r = requests.head(link) #how to handle error in case this fails?
charset = r.encoding
if (not charset):
    charset = "utf-8"

當請求無法獲取標頭時我收到錯誤：

 File "parsexml.py", line 78, in parsefile
  r = requests.head(link)
 File "/usr/lib/python2.7/dist-packages/requests/api.py", line 74, in head
   return request('head', url, **kwargs)
 File "/usr/lib/python2.7/dist-packages/requests/api.py", line 40, in request
   return s.request(method=method, url=url, **kwargs)
 File "/usr/lib/python2.7/dist-packages/requests/sessions.py", line 229, in request
   r.send(prefetch=prefetch)
 File "/usr/lib/python2.7/dist-packages/requests/models.py", line 605, in send
   raise ConnectionError(e)
 requests.exceptions.ConnectionError: HTTPConnectionPool(host='www.standardzilla.com', port=80): Max retries exceeded with url: /2008/08/01/diaries-of-a-freelancer-day-thirty-seven/

Answer 1

您應該將代碼放在try-except塊中，捕獲ConnectionErrors。 像這樣：

try:
    r = requests.head(link) //how to handle error in case this fails?
    charset = r.encoding
    if (not charset):
      charset = "utf-8"
except requests.exceptions.ConnectionError:
    print 'Unable to access ' + link