Python can connect to MongoDB using the pymongo module. To start off with, I will create a file called process_large_data.py and import the pymongo and csv modules. You will need to import both pymongo and MongoClient as I have done in the demonstration:
import csv
import pymongo
from pymongo import MongoClient
MongoClient takes care of establishing a connection and interfacing with the database system. The following steps in process_large_data.py will create an object assigned to the collection variable, which can be used to insert documents into the database:
....
from pymongo import MongoClient
## create a MongoClient object,
## used to connect and interface
## with mongodb
client = MongoClient()
## these two lines create a collection
## object which allows you to interface
## with a particular collection
db = client.weather
collection...
