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初始化代码
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‎.gitignore

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__pycache__/
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.DS_Store
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.idea/

‎chapter_10/QASystem/Pipfile

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[[source]]
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url = "https://pypi.python.org/simple"
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verify_ssl = true
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name = "pypi"
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[packages]
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flask = "*"
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redis = "*"
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pymongo = "*"
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[dev-packages]
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‎chapter_10/QASystem/Pipfile.lock

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Some generated files are not rendered by default. Learn more about customizing how changed files appear on GitHub.

‎chapter_10/QASystem/answer/MongoUtil.py

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import pymongo
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import json
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from bson import ObjectId
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class MongoUtil(object):
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def __init__(self):
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db = pymongo.MongoClient().qa_system
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self.question = db.question
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self.answer = db.answer
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def query_question(self):
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question_iter_obj = self.question.aggregate([
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{'$lookup': {
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'from': 'answer',
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'localField': '_id',
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'foreignField': 'question_id',
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'as': 'answer_list'}}])
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question_list = []
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for question in question_iter_obj:
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question_list.append(
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{'title': question['title'],
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'detail': question['detail'],
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'author': question['author'],
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'vote_up': question['vote_up'] - question['vote_down'],
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'answer_number': len(question['answer_list']),
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'question_id': str(question['_id'])
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}
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)
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return question_list
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def query_answer(self, question_id):
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answer_iter_obj = self.question.aggregate([
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{'$match': {'_id': ObjectId(question_id)}},
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{'$lookup': {
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'from': 'answer',
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'localField': '_id',
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'foreignField': 'question_id',
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'as': 'answer_list'}}])
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question_answer = list(answer_iter_obj)[0]
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question_answer_dict = {
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'question_id': str(question_answer['_id']),
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'question_title': question_answer['title'],
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'question_detail': question_answer['detail'],
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'question_author': question_answer['author'],
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'answer_num': len(question_answer['answer_list'])
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}
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answer_list = []
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for answer in question_answer['answer_list']:
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answer_list.append(
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{'answer_detail': answer['answer'],
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'answer_author': answer['author'],
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'answer_id': str(answer['_id']),
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'answer_vote': answer['vote_up'] - answer['vote_down']})
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question_answer_dict['answer_list'] = answer_list
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return question_answer_dict
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def insert_answer(self, question_id, answer, author, now, vote_up=0, vote_down=0):
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data_to_insert = {
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'author': author,
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'question_id': ObjectId(question_id),
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'answer': answer,
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'answer_time': now,
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'vote_up': vote_up,
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'vote_down': vote_down
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}
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self.answer.insert_one(data_to_insert)
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return True
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def insert_question(self, title, detail, author, now, vote_up=0, vote_down=0):
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data_to_insert = {
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'title': title,
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'detail': detail,
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'author': author,
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'ask_time': now,
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'vote_up': vote_up,
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'vote_down': vote_down
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}
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self.question.insert_one(data_to_insert)
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return True
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def vote_for_question(self, object_id, value):
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self.question.update_one({'_id': ObjectId(object_id)}, {'$inc': {value: 1}})
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return True
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def vote_for_answer(self, object_id, value):
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self.answer.update_one({'_id': ObjectId(object_id)}, {'$inc': {value: 1}})

‎chapter_10/QASystem/answer/__init__.py

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‎chapter_10/QASystem/file_structure.txt

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.
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├── Pipfile
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├── Pipfile.lock
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├── answer
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│   ├── MongoUtil.py
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│   └── __init__.py
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├── generate_answer.py
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├── generate_question.py
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├── main.py
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├── static
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│   ├── css
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│   │   ├── spectre-icons.css
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│   │   └── spectre.min.css
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│   ├── img
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│   │   └── avatar.png
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│   └── js
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│   ├── jquery-3.3.1.min.js
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│   └── post_question_and_answer.js
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├── templates
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│   ├── answer_list.html
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│   ├── base.html
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│   └── index.html
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├── util
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│   ├── __init__.py
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│   └── utils.py
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└── your_code_here
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├── MongoUtil.py
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└── __init__.py

‎chapter_10/QASystem/generate_answer.py

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import pymongo
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from bson import ObjectId
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handler = pymongo.MongoClient().qa_system.answer
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answer = [
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{'author': '王小一',
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'question_id': ObjectId("5b8b8fb9d3a25054b7a0dc23"),
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'answer': '毫无疑问，必定为2',
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'answer_time': '2018-07-23 12:18:11',
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'vote_up': 10,
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'vote_down': 200},
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{'author': '钱小九',
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'question_id': ObjectId("5b8b8fb9d3a25054b7a0dc23"),
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'answer': '楼上的，自问自答有意思吗？',
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'answer_time': '2018-07-23 12:18:11',
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'vote_up': 100,
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'vote_down': 20},
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{'author': '孙小十',
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'question_id': ObjectId("5b8b8fb9d3a25054b7a0dc23"),
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'answer': '在某些情况下可能等于三。题主应该补充必要信息。',
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'answer_time': '2018-07-23 12:18:11',
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'vote_up': 0,
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'vote_down': 100},
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{'author': '张若虚',
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'question_id': ObjectId("5b8b8fb9d3a25054b7a0dc26"),
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'answer': '这是我写的诗，下一句是：愿逐月华流照君。诗名为：《春江花月夜》',
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'answer_time': '2018-07-23 12:18:11',
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'vote_up': 1000,
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'vote_down': 0},
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{'author': '阿东莫夫',
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'question_id': ObjectId("5b8b8fb9d3a25054b7a0dc24"),
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'answer': '这是阿西莫夫的《银河系漫游指南》里面的',
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'answer_time': '2018-07-23 12:18:11',
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'vote_up': 20,
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'vote_down': 21},
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{'author': '道格拉斯',
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'question_id': ObjectId("5b8b8fb9d3a25054b7a0dc24"),
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'answer': '楼上的别乱说啊，《银河系漫游指南》是英国作家道格拉斯·亚当斯写的。',
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'answer_time': '2018-07-23 12:18:11',
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'vote_up': 60,
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'vote_down': 10},
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{'author': '张起灵',
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'question_id': ObjectId("5b8b8fb9d3a25054b7a0dc24"),
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'answer': '是英国作家道格拉斯·亚当斯写的《银河系漫游指南》里面的原话。原因是42在ASCII码中对应了*号，而*号在通配符中代表一切',
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'answer_time': '2018-07-23 12:18:11',
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'vote_up': 200,
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'vote_down': 1},
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{'author': '老司机',
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'question_id': ObjectId("5b8b8fb9d3a25054b7a0dc29"),
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'answer': '楼主，这不是去幼儿园的车！我只说作者是兰陵笑笑生，至于书名嘛，哈哈哈哈哈。',
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'answer_time': '2018-07-23 12:18:11',
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'vote_up': 0,
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'vote_down': 100},
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{'author': '小文青',
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'question_id': ObjectId("5b8b8fb9d3a25054b7a0dc29"),
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'answer': '警察叔叔，这里有人在飙车。我认为兰陵笑笑生应该说王世贞。至于书名嘛，哈哈哈哈哈。',
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'answer_time': '2018-07-23 12:18:11',
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'vote_up': 30,
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'vote_down': 0},
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{'author': '欧阳掏粪',
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'question_id': ObjectId("5b8b8fb9d3a25054b7a0dc29"),
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'answer': '《明朝那些事儿》里面讲了的，你去看看。',
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'answer_time': '2018-07-23 12:18:11',
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'vote_up': 40,
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'vote_down': 3},
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]
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handler.insert_many(answer)

‎chapter_10/QASystem/generate_question.py

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import pymongo
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handler = pymongo.MongoClient().qa_system.question
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question = [
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{'author': '王小一',
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'title': '1+1=?',
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'detail': '请问1+1等于几？',
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'ask_time': '2018-07-23 12:18:11',
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'vote_up': 0,
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'vote_down': 100},
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{'author': '张小二',
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'title': '为什么说42 is the answer of all?',
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'detail': '这句话出自哪里？',
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'ask_time': '2018-07-23 12:18:11',
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'vote_up': 100,
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'vote_down': 0},
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{'author': '刘小三',
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'title': '明天天气如何？',
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'detail': '明天会下雨吗？',
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'ask_time': '2018-07-23 12:18:11',
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'vote_up': 10,
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'vote_down': 10},
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{'author': '旺小四',
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'title': '此时相忘不相闻下一句是什么?',
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'detail': '还有，这是谁写的诗？',
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'ask_time': '2018-07-23 12:18:11',
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'vote_up': 100,
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'vote_down': 3},
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{'author': '赵小五',
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'title': '把微波炉温度调低一些，可以孵鸡蛋吗？',
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'detail': '孵蛋除了温度还需要什么？',
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'ask_time': '2018-07-23 12:18:11',
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'vote_up': 23,
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'vote_down': 3},
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{'author': '朱小六',
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'title': '四大名著你喜欢哪一本？',
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'detail': '请回答具体原因。',
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'ask_time': '2018-07-23 12:18:11',
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'vote_up': 70,
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'vote_down': 2},
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{'author': '马小七',
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'title': '你知道明朝时期的四大名著，除了《西游记》《水浒传》和《三国演义》还有一本是什么吗？',
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'detail': '这本书的作者又是是呢？',
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'ask_time': '2018-07-23 12:18:11',
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'vote_up': 120,
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'vote_down': 16},
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]
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handler.insert_many(question)

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