Simple CRUD in Python with MongoDB

crud.py

#!/usr/bin/env python
# -*- coding:latin-1 -*-

'''
Created on 29/04/2015
Author: Bruno

This code is a only exemple who to do a basic CRUD in Python 2.7 with MongoDB 2.6.
'''

from pymongo import *

class MongoDB_Python:
    def __init__(self):
        # Initialize the connection on the data base.
        self.conn = MongoClient('localhost', 27017)
        self.db = self.conn.TestDB       # Data Base name:  TestDB
        self.cursor = self.db.collection # Collection name: collection
        
    def create(self, query={}):
        # Insert a new register.
        self.cursor.insert(query)
        
    def read(self, query={}):
        # Read all the register.
        for value in self.cursor.find(query):
            print(value)
        
    def update(self, query_1={}, query_2={}):
        # Change the first item on the list.
        self.cursor.update(query_1, query_2)
    
    def delete(self):
        # Delete all the elements on the list.
        for i in self.cursor.find():
            self.cursor.remove(i)

if __name__ == '__main__':
    mongo = MongoDB_Python()

    for x in range(3):
        reg = {'_id':x, 'x':x, 'list':['first', 'second', 'third','fourth', 'fifth']}
        mongo.create(reg)
        
    print('Read before update.')
    mongo.read()
    
    mongo.update({'x':0, 'list':'first'}, {'$set':{'list.$':'primeiro'}})
    
    # Add a new element on the list.
    mongo.update({'x':1}, {"$addToSet":{'list':{'$each':['fifth', 'sixth', 'seventh']}}})
    
    # Remove one element on the list.
    mongo.update({'x':2}, {'$pull':{'list':'fifth'}})
    
    print('Read after update.')
    mongo.read()
    
    mongo.delete()