We are going to use a sample init_data.json file with two accounts. Alex has 100 of the hypnotons imaginary currency, whereas Mary has 50 of them:

{"collection": "accounts", "account_id": "1", "account_name": "Alex", "account_balance":100}{"collection": "accounts", "account_id": "2", "account_name": "Mary", "account_balance":50}

Using the following Python code, we can insert these values into our database as follows:

import json
class InitData:
   def __init__(self):
       self.client = MongoClient('localhost', 27017)
       self.db = self.client.mongo_bank
       self.accounts = self.db.accounts
       # drop data from accounts collection every time to start from a clean slate
       self.accounts.drop()
       # load data from json and insert them into our database
       init_data = InitData.load_data(self)
       self.insert_data(init_data)
   @staticmethod
   def load_data(self):
       ret = []
       with open('init_data.json', 'r') as f:
           for line in f:
               ret.append(json.loads(line))
       return ret
   def insert_data(self, data):
       for document in data:
           collection_name = document['collection']
           account_id = document['account_id']
           account_name = document['account_name']
           account_balance = document['account_balance']
           self.db[collection_name].insert_one({'account_id': account_id, 'name': account_name, 'balance': account_balance})

This results in our mongo_bank database having the following documents in our accounts collection:

> db.accounts.find()
{ "_id" : ObjectId("5bc1fa7ef8d89f2209d4afac"), "account_id" : "1", "name" : "Alex", "balance" : 100 }
{ "_id" : ObjectId("5bc1fa7ef8d89f2209d4afad"), "account_id" : "2", "name" : "Mary", "balance" : 50 }