The correct implementation to the transfer problem will look like the following code (the full code sample is attached with the code bundle):
from pymongo import MongoClientimport jsonclass InitData: def __init__(self): self.client = MongoClient('localhost', 27017, w='majority') 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() init_data = InitData.load_data(self) self.insert_data(init_data) self.transfer('1', '2', 300) @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 ...
