I am using PyMongo. Do I have to close a MongoClient after use?

I am using PyMongo, and I have some questions about connection and cursor.

  1. Do I have to close a cursor? I want to know because I really want to do something like this.
 for s in collection.find():
  1. Do I have to close a MongoClient manually? Will it affect the connection polling feature of PyMongo?
from pymongo import MongoClient

url = 'mongodb://localhost:27017'
client = MongoClient(url)               # create MongoClient

db = client['test']                     # client.dbname
collection = db['students']             # db.collname

cursor = collection.find()
for s in cursor:

cursor .close()      # Is this required?
client.close()         # Is this required?


the document doesn’t say if that is required or not. But generally if a “close” is provided, it’s better to call it when the object is no longer needed. (to save compute resources).

For “client” i suppose it can be kept without closing there until the application terminates (process exits), but for a “cursor” i would suggest to close it when the its use is done.

Thank you for your question.

@Kobe_W is correct, best practice is to call close() when the client is no longer needed or use the client in a with-statement:

with MongoClient(url) as client:
    # use client here

It’s also a good idea to call close() on the cursor too, the best way would be to use a with-statement like this:

with collection.find() as cursor:
    for s in cursor:

When PyMongo’s MongoClient and cursor objects are garbage collected without being closed pymongo will clean up application-side resources automatically (connections, threads, etc…) however some server-side resources could be left open (cursors, sessions). Calling close() explicitly (or using a with-statement) will clean up these server-side resources that would otherwise be left around until they timeout.

I just opened this ticket to improve our documentation around these ideas: https://jira.mongodb.org/browse/PYTHON-3606