>>> result = books.update_one({"isbn": "101"}, {"$set": {"price": 100}})
>>> print(result.matched_count)
1
>>> print(result.modified_count)
1

Similar to inserting documents, when updating we can use update_one or update_many:

• The first argument here is the filter document for matching the documents that will be updated
• The second argument is the operation to be applied to the matched documents
• The third (optional) argument is upsert=false (default) or true, used to create a new document if it's not found

Another interesting argument is the optional bypass_document_validation=false (default) or true. This will ignore validations (if there are any) for the documents in the collection.

The resulting object will have matched_count for the number of documents that matched the filter query and modified_count for the number of documents that were affected by the update part of the query.

In our example, we are setting price=100 for the first book with isbn=101 through the $set update operator. A list of all update operators is shown in the Update operators section later in this chapter.