test: update python example

docs/examples/python/develop_tutorial.py

@@ -17,8 +17,6 @@ print("server version:", conn.server_info)
 # ANCHOR: insert
 # create super table
 conn.execute("CREATE STABLE power.meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (location BINARY(64), groupId INT)")
-print("affected_row", affected_row)  # 0
-
 # insert multiple rows into multiple tables at once. subtables will be created automatically.
 affected_row = conn.execute("""INSERT INTO power.d1001 USING power.meters TAGS(California.SanFrancisco, 2) VALUES ('2018-10-03 14:38:05.000', 10.30000, 219, 0.31000) ('2018-10-03 14:38:15.000', 12.60000, 218, 0.33000) ('2018-10-03 14:38:16.800', 12.30000, 221, 0.31000)
     power.d1002 USING power.meters TAGS(California.SanFrancisco, 3) VALUES ('2018-10-03 14:38:16.650', 10.30000, 218, 0.25000)