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Building social network with Neo4j and Python, Андрей Солдатенко, Toptal

Building social network with Neo4j and Python, Андрей Солдатенко, Toptal

Выступление на конференции PyCon Russia 2016

IT-People

July 28, 2016
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  1. Agenda: • Who am I? • 101 Graph data structure

    in Python • neo4j overview • PEP-249 and Neo4j • other python neo4j clients
  2. Andrii Soldatenko • Backend Python Developer at • CTO in

    Persollo.com • Speaker at many PyCons and Python meetups • blogger at https://asoldatenko.com
  3. 101 Graph data structure graph = {'A': ['B', 'C'], 'B':

    ['C', 'D'], 'C': ['D'], 'D': ['C'], 'E': ['F'], 'F': ['C']} from https://www.python.org/doc/essays/graphs/
  4. 101 Graph data structure def find_path(g, s, e, path=[]): path

    = path + [s] if s == e: return path if not s in g: return None for node in g[s]: if node not in path: newpath = find_path(g, node, e, path) if newpath: return newpath return None
  5. 101 Graph data structure >>> graph = {'A': ['B', 'C'],

    'B': ['C', 'D'], 'C': ['D'], 'D': ['C'], 'E': ['F'], 'F': ['C']} >>> find_path(graph, 'A', 'D') ['A', 'B', 'C', 'D'] >>>
  6. Cypher: Example ╒══════════════════════╕ !tomHanksMovies.title ! ╞══════════════════════╡ !Charlie Wilson's War !

    "######################$ !The Polar Express ! "######################$ !A League of Their Own ! !Apollo 13 ! "######################$ !The Green Mile ! "######################$
  7. Contra - unable to handle lots of data - when

    you want to update all or a subset of entities
  8. https://github.com/nigelsmall/py2neo Graph Data Types Graph Databases Batch & Manual Indexing

    Calendar subgraph neokit – Command Line Toolkit for Neo4 Object-Graph Mapping
  9. Python DB API 2.0 for Neo4j https://github.com/jakewins/neo4jdb-python class Connection(object): def

    __init__(self, db_uri): self.errorhandler = default_error_handler self._host = urlparse(db_uri).netloc self._http = http.HTTPConnection(self._host) self._tx = TX_ENDPOINT self._messages = [] self._cursors = set() self._cursor_ids = 0
  10. neo4jdb-python https://github.com/jakewins/neo4jdb-python >>> from neo4j.contextmanager import Neo4jDBConnectionManager >>> >>> >>>

    neo_url = 'http://localhost:7474' >>> manager = Neo4jDBConnectionManager(neo_url) >>> with manager.write() as w: ... w.execute("CREATE (TheMatrix:Movie {title:'The Matrix'})") ...
  11. class FriendRel(StructuredRel): since = DateTimeProperty(default=lambda: datetime.now(pytz.utc)) met = StringProperty() class

    Person(StructuredNode): name = StringProperty() friends = RelationshipTo('Person', 'FRIEND', model=FriendRel) rel = jim.friend.connect(bob) rel.since # datetime object