human
Solve the following python programming problem given the following code:
def __init__(self, config = None) : 
    (super (Mongo, self).__init__ (),) 
    self.config = config 
    self.mongo_url = self.config.get ('MONGO_URL', 'mongodb://localhost') 
    self.database_name = self.config.get ('DATABASE', 'flask_profiler') 
    self.collection_name = self.config.get ('COLLECTION', 'measurements') 
    def createIndex() : 
        self.collection.ensure_index ([('startedAt', 1), ('endedAt', 1), ('elapsed', 1), ('name', 1), ('method', 1)]) 
self.client = pymongo.MongoClient (self.mongo_url) 
    self.db = self.client [config.database_name] 
    self.collection = self.db [self.collection_name] 
    createIndex () 

    
    

    Fix the buggy line: self.db = self.client [config.database_name]
assistant
#Here is Python program to fix the buggy line: self.

self.db = self.client [self.database_name]