暂时貌似可以通过输入问题的ID来获取全部回答了。

每一条回答都会以json格式存储在本地的MongoDB中。

import pymongo,requests
import multiprocessing as mp

#浏览器头
headers = {
    'user-agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36',
    }

#输入问题的ID，获取链接
def generate_url():
    question_id = input('输入问题的ID:')
    url = 'https://www.zhihu.com/api/v4/questions/' + question_id + '/answers?'
    print('\n您即将采集的问题链接为：{}\n'.format(url))
    return url

#获取回答数
def get_max_num(url):
    params = {
    'offset': 0,
    'limit': 5,
    'sort_by': 'default',
    'platform': 'desktop'
    }
    try:
        r = requests.get(url,headers=headers,params=params).json()
        max_num = r['paging']['totals']
        print('该问题共有{}条回答。\n'.format(max_num))
        return max_num
    except:
        print('该问题不存在！')

#生成链接、回答总数和偏移量的列表
def generate_offsets():
    global url,max_num
    url = generate_url()
    max_num = get_max_num(url)
    offset = [offset for offset in range(0,max_num,20)]
    return offset

#从当前的偏移量（回答编号）开始，向后获取20个回答
def get_answer_json(offset):
    params = {
    'include': 'data[*].is_normal,admin_closed_comment,reward_info,is_collapsed,annotation_action,annotation_detail,collapse_reason,is_sticky,collapsed_by,suggest_edit,comment_count,can_comment,content,editable_content,voteup_count,reshipment_settings,comment_permission,created_time,updated_time,review_info,relevant_info,question,excerpt,relationship.is_authorized,is_author,voting,is_thanked,is_nothelp,is_labeled,is_recognized,paid_info,paid_info_content;data[*].mark_infos[*].url;data[*].author.follower_count,badge[*].topics',
    'offset': offset,
    'limit': 20,
    'sort_by': 'default',
    'platform': 'desktop'
    }
    r = requests.get(url,headers=headers,params=params).json()
    return r['data']

#创建用以存储数据的集合
def create_data_collection():
    global database,collection
    database = input('输入用于存储的数据库名：')
    collection = input('\n输入用于存储的数据集合名：')
    client = pymongo.MongoClient('mongodb://localhost:27017')
    database = client[database]
    collection = database[collection]
    print('\n采集的回答将被存储到本地MongoDB的{}表中。\n'.format(collection))

#调用get_answer_json()并将结果存储到数据库中
def save_to_DB(offset):
    data = get_answer_json(offset)
    collection.insert_many(data)
    if (offset+20) < max_num:
        print('已完成{}条回答的采集'.format(offset+20))
    elif (offset+20) > max_num:
        print('已完成{}条回答的采集'.format(max_num))
        print('任务完成！')

if __name__ == '__main__':
    offset = generate_offsets()
    create_data_collection()
    #多线程执行save_to_DB()
    p = mp.Pool()
    p.map_async(save_to_DB,offset)
    p.close()
    p.join()