isabella232 / neo4j-python-driver

Neo4j Bolt driver for Python

Neo4j Bolt Driver for Python

This repository contains the official Neo4j driver for Python. Each driver release (from 4.0 upwards) is built specifically to work with a corresponding Neo4j release, i.e. that with the same major.minor version number. These drivers will also be compatible with the previous Neo4j release, although new server features will not be available.

• Python 3.9 supported.
• Python 3.8 supported.
• Python 3.7 supported.
• Python 3.6 supported.
• Python 3.5 supported.

Python 2.7 support has been dropped as of the Neo4j 4.0 release.

Installation

To install the latest stable version, use:

pip install neo4j

Quick Example

from neo4j import GraphDatabase

driver = GraphDatabase.driver("neo4j://localhost:7687", auth=("neo4j", "password"))

def add_friend(tx, name, friend_name):
    tx.run("MERGE (a:Person {name: $name}) "
           "MERGE (a)-[:KNOWS]->(friend:Person {name: $friend_name})",
           name=name, friend_name=friend_name)

def print_friends(tx, name):
    for record in tx.run("MATCH (a:Person)-[:KNOWS]->(friend) WHERE a.name = $name "
                         "RETURN friend.name ORDER BY friend.name", name=name):
        print(record["friend.name"])

with driver.session() as session:
    session.write_transaction(add_friend, "Arthur", "Guinevere")
    session.write_transaction(add_friend, "Arthur", "Lancelot")
    session.write_transaction(add_friend, "Arthur", "Merlin")
    session.read_transaction(print_friends, "Arthur")

driver.close()

Connection Settings Breaking Change

• The driver’s default configuration for encrypted is now false (meaning that driver will only attempt plain text connections by default).
• Connections to encrypted services (such as Neo4j Aura) should now explicitly be set to encrypted.
• When encryption is explicitly enabled, the default trust mode is to trust the CAs that are trusted by operating system and use hostname verification.
• This means that encrypted connections to servers holding self-signed certificates will now fail on certificate verification by default.
• Using the new neo4j+ssc scheme will allow to connect to servers holding self-signed certificates and not use hostname verification.
• The neo4j:// scheme replaces bolt+routing:// and can be used for both clustered and single-instance configurations with Neo4j 4.0.

See, https://neo4j.com/docs/migration-guide/4.0/upgrade-driver/#upgrade-driver-breakingchanges

See, https://neo4j.com/docs/driver-manual/current/client-applications/#driver-connection-uris for changes in default security settings between 3.x and 4.x

Connecting with Python Driver 4.x to Neo4j 3.5

Using the Python Driver 4.x and connecting to Neo4j 3.5 with default connection settings for Neo4j 3.5.

# the preferred form

driver = GraphDatabase.driver("neo4j+ssc://localhost:7687", auth=("neo4j", "password"))

# is equivalent to

driver = GraphDatabase.driver("neo4j://localhost:7687", auth=("neo4j", "password"), encrypted=True, trust=False)

Connecting with Python Driver 1.7 to Neo4j 4.x

Using the Python Driver 1.7 and connecting to Neo4j 4.x with default connection settings for Neo4j 4.x.

driver = GraphDatabase.driver("neo4j://localhost:7687", auth=("neo4j", "password"), encrypted=False)

Other Information

• The Neo4j Operations Manual
• The Neo4j Drivers Manual
• Python Driver API Documentation
• Neo4j Cypher Refcard
• Example Project
• Driver Wiki (includes change logs)
• Neo4j 4.0 Migration Guide