In this post, Assuming that we have already installed mongodb successfully and MongoDB instance is running on the default host and port.

I. Install pymongo 

Installing pymongo by easy_instal. In terminal, just type:
  
sudo easy_install pymongo
If your computer haven't installed easy_install yet. You will face with the message :
The program 'easy_install' is currently not installed. You can install it by typing: sudo apt-get install python-setuptools
Just type: 
sudo apt-get install python-setuptools
first. After that type easy_install command that I mentioned above to get Pymongo.

II. Test connection with MongoDb

After finishing installation, Let's test Pymongo by using the following python commands in terminal.

1.Get connection, show all document databases of mongodb

By importing pymongo, making a connection and use database_names() command to get the list of current databases in mongodb. 
# use the following command step by step in terminal
import pymongo

#get Client
client = pymongo.MongoClient("localhost", 27017)

#show all mongo document databases
client.database_names()
In my PC,2 databases are existed ( the image belows). They are test and local.
I will choose test databases and show all colletions of Test.

2.Show all collections of a Document database in mongoDb 

# choose a database
db = client.test
 
# show all collections of test database
db.collection_names()

Find, insert, update, save, remove documents using pymongo

Insert new document and see the result by find all documents in Test collection. 
# insert new document to collection 
collection.insert({'hello':'hello codingtip.blogspot.com'})

# print all item in test collection 
for item in collection.find():
...     print item

Update current document 
#update current document 
collection.update({'hello':'hello codingtip.blogspot.com'},{'$set':{'reply':'hi!'}})
# print all item in test collection 
for item in collection.find():
...     print item

Remove all documents in current Collection: 
 
#remove all documents in current collection 
collection.remove()
# print all item in test collection 
for item in collection.find():
...     print item