Question

我正在使用Facebook API并查看帖子的反应。 FB将响应限制为最多100条记录，但是分页以获得下一批等等。

我的测试案例有超过100个反应（最后计数：550）。我想要返回的是一个元组列表，其中每个元组都是对帖子的反应。

这是我到目前为止...输出列表比预期的少100多 -

import requests



def get_next_linksv3(page):
    while True:
    #try:
        r = requests.get(page)
        r_json = r.json()
        if 'paging' in r_json.keys() and 'next' in r_json['paging']:
            page = r_json['paging']['next']
            yield page
        else:
            return

def process_follow_on_reactions_link(next_link, list_reaction_tuples):
    nr = requests.get(next_link)
    r_json = nr.json()
    tmp_list = []
    if 'data' in r_json.keys():
        for nrecord in r_json['data']:
            reaction_id = nrecord['id']
            reaction_id_name = nrecord['name']
            reaction_type = nrecord['type']
            tmp_list.append((reaction_id,reaction_id_name,reaction_type))
    return tmp_list



def process_initial_reactions_link(link):
    list_reaction_tuples = []
    r = requests.get(link)
    r_json = r.json()
    if 'reactions' in r_json.keys():
        for record in r_json['reactions']['data']:
            reaction_id = record['id']
            reaction_id_name = record['name']
            reaction_type = record['type']
            list_reaction_tuples.append((reaction_id,reaction_id_name,reaction_type))
    if 'reactions' in r_json.keys() and 'paging' in r_json['reactions'] and 'next' in r_json['reactions']['paging']:
        next_link = r_json['reactions']['paging']['next']
        gen  = get_next_linksv3(next_link)
        while True:
            try:
                list_reaction_tuples = list_reaction_tuples + (process_follow_on_reactions_link(next(gen), list_reaction_tuples))
            except StopIteration:
                return list_reaction_tuples

    return list_reaction_tuples

tuple_list = process_initial_reactions_link(target_link)

Answer 1

它可能会挂起等待某些数据或循环旋转。最有可能在while True循环中。当它得到不正确的（或产生除所需的其他输出）URL（if条件不满足）时，生成器不断下载相同的页面而永远不会产生。您可能需要引入一些max_retries变量而不是while True循环。

在调试器下运行程序并精确定位它挂起的位置。如果不可能 - 使用简单的打印调试方法。并向我们展示踪迹。

这是我的发电机应用错了吗？

1 个答案: