Question

我使用以下代码查询Facebook，迭代页面名称列表以获取页面的数字ID并将其存储在字典中。然而，我继续追赶HTTP 500 error;但是，这并没有出现在我在这里提供的短名单中。见代码：

import json
def FB_IDs(page_name, access_token=access_token):
    """ get page's numeric information """  
    # construct URL 
    base = "https://graph.facebook.com/v2.4"
    node = "/" + str(page_name)
    parameters = "/?access_token=%s" % access_token
    url = base + node + parameters
    # retrieve data    
    with urllib.request.urlopen(url) as url:
        data = json.loads(url.read().decode()) 
    return data

pages_ids_dict = {}
for page in pages:
    pages_ids_dict[page] = FacebookIDs(page, access_token)['id']

如何自动执行此操作并避免错误？

Answer 1

有一个非常标准的辅助函数，您可能需要查看它：

### HELPER FUNCTION ###
def request_until_succeed(url):
    """ helper function to catch HTTP error 500"""
    req = urllib.request.Request(url)
    success = False

    while success is False:
        try: 
            response = urllib.request.urlopen(req)
            if response.getcode() == 200:
                success = True
        except Exception as e:
            print(e)
            time.sleep(5)
            print("Error for URL") # use following code if URL shall be printed %s: %s" % (url, datetime.datetime.now()))
    return response.read()

将该功能实现到您的功能中，以便您的函数通过该函数调用URL，您应该没问题。

抓住“HTTP500错误”

1 个答案: