The Neo4j Python driver's session object has a read_transaction method that you can use for marking read queries explicitly.

For Version 4 of the driver, the below example using the read_transaction function is correct:

def get_actors(tx, movie_name):  # Define Unit of work
   result = tx.run(
       "MATCH (p:Person)-[:ACTED_IN]->(m) "
       "WHERE toLower(m.title) CONTAINS toLower($title) "
       "RETURN DISTINCT p.name as actorsTx",
       title=movie_name)  # Named parameters
   return [record["actorsTx"] for record in result]

try:
   with driver.session() as session:
       # Run the unit of work within a Read Transaction
       actors = session.read_transaction(get_actors, movie_name="matrix")
       for actor in actors:
           print(f"Found actor: {actor}")
except Exception as e:
   print(f"Exception while running read query: {e}")

For Version 5 of the driver, the below example using the execute_read function is correct:

def get_actors(tx, movie_name):  # Define Unit of work
   result = tx.run(
       "MATCH (p:Person)-[:ACTED_IN]->(m) "
       "WHERE toLower(m.title) CONTAINS toLower($title) "
       "RETURN DISTINCT p.name as actorsTx",
       title=movie_name)  # Named parameters
   return [record["actorsTx"] for record in result]

try:
   with driver.session() as session:
       # Run the unit of work within a Read Transaction
       actors = session.execute_read(get_actors, movie_name="matrix")
       for actor in actors:
           print(f"Found actor: {actor}")
except Exception as e:
   print(f"Exception while running read query: {e}")