使用 py2neo 导入 neo4j

Question

I am unable to import 'neo4j' using py2neo. When I do the following;

 from py2neo import neo4j

I get the error:

  cannot import name 'neo4j' 

My py2neo version is 3.1.2

The output for the following is:

dir(py2neo)

['BoltDataSource', 'BoltNode', 'BoltPath', 'BoltRelationship', 'BoltTransaction', 'ClientError', 'Commander', 'ConstraintError', 'Cursor', 'CypherSyntaxError', 'CypherTypeError', 'CypherWriter', 'DBMS', 'DataSource', 'DatabaseError', 'Entity', 'Forbidden', 'Graph', 'GraphDatabase', 'GraphError', 'HTTPDataSource', 'HTTPResponse', 'HTTPTransaction', 'JAVA_INTEGER_MAX_VALUE', 'JAVA_INTEGER_MIN_VALUE', 'JSONResponse', 'Mapping', 'NOT_FOUND', 'Node', 'NodeSelection', 'NodeSelector', 'OrderedDict', 'PRODUCT', 'PULL_ALL', 'Path', 'PropertyDict', 'RUN', 'Record', 'Relatable', 'Relationship', 'RemoteEntity', 'ReprIO', 'Resource', 'ResourceTemplate', 'Response', 'Schema', 'ServerAddress', 'ServerAuth', 'ServerError', 'ServerPlugin', 'SetView', 'StringIO', 'Subgraph', 'ThreadLocalEntityCache', 'Transaction', 'TransactionFinished', 'TransientError', 'UNAUTHORIZED', 'URI', 'Unauthorized', 'UnmanagedExtension', 'Walkable', 'Watcher', '__author__', '__builtins__', '__cached__', '__copyright__', '__doc__', '__email__', '__file__', '__license__', '__loader__', '__name__', '__package__', '__path__', '__spec__', '__version__', 'auth', 'authenticate', 'b64encode', 'basic_auth', 'bolt_hydrate', 'caching', 'cast', 'cast_node', 'cast_relationship', 'chain', 'client_errors', 'coerce_atomic_property', 'coerce_property', 'compat', 'cypher', 'cypher_escape', 'cypher_repr', 'cypher_request', 'database', 'deprecated', 'deque', 'ext', 'get_auth', 'get_http_headers', 'getenv', 'http', 'integer', 'is_collection', 'json_dumps', 'keyring', 'main', 'mktime_tz', 'normalise_request', 'order', 'packages', 'parsedate_tz', 'raise_from', 'register_server', 'relationship_case', 'remote', 'round_robin', 'selection', 'set_http_header', 'size', 'snake_case', 'status', 'stdout', 'string', 'types', 'unicode', 'update_stats_keys', 'user_agent', 'ustr', 'util', 'uuid4', 'version_tuple', 'walk', 'warn', 'watch', 'webbrowser', 'xstr']

How do I import neo4j from py2neo?

Answer 1

Why do you think you can import neo4j from py2neo? Look carefully in py2neo documentation: http://py2neo.org/v3/

Your import statement should look something like from py2neo import Graph, Node, Relationship, authenticate

Answer 2

If you want to create nodes relationship with tradtional codeing way you can create it with importing the Node, Relationship, Graph, etc from py2neo like:

from py2neo import Graph, Node, Relationship, authenticate

But if you want to execute cypher queries you need neo4j to be installed and import it on you code

install neo4j with pip

pip install neo4j

import neo4j

driver = neo4j.GraphDatabase.driver('bolt://localhost',auth=basic_auth("neo4j", "Password1"))

def get_db():
    if not hasattr(g, 'neo4j_db'):
        g.neo4j_db = driver.session()
    return g.neo4j_db

db = get_db()
results = db.run("MATCH (movie_1:Movie) "
                 "WHERE movie_1.title =~ {title} "
                 "RETURN movie", {"title": "(?i).*" + q + ".*"}