add python example

docs/examples/python/connect_example.py

@@ -3,15 +3,18 @@ import taos
 def create_connection():
     # all parameters are optional.
     conn = None
+    host = "localhost"
+    port = 6030
     try:
         conn = taos.connect(
             user="root",
             password="taosdata",
-            host="localhost",
+            host=host,
-            port=6030,
+            port=port,
         )
+        print(f"Connected to {host}:{port} successfully.");
     except Exception as err:
-        print(err)
+        print(f"Failed to connect to {host}:{port} ; Err:{err}")
     finally:
         if conn:
             conn.close()

docs/examples/python/connect_rest_example.py

@@ -3,16 +3,16 @@ import taosrest
 
 def create_connection():
     conn = None
+    url="http://localhost:6041"
     try:
-        conn = taosrest.connect(url="http://localhost:6041",
+        conn = taosrest.connect(url=url,
                                 user="root",
                                 password="taosdata",
                                 timeout=30)
         
-        print("Connection established")
+        print(f"Connected to {url} successfully.");
-        
     except Exception as err:
-        print(err)
+        print(f"Failed to connect to {url} ; Err:{err}")
     finally:
         if conn:
             conn.close() 

docs/examples/python/connect_websocket_examples.py

@@ -3,36 +3,35 @@ import taosws
 
 def create_connection():
     conn = None
+    host = "localhost"
+    port = 6041
     try:
         conn = taosws.connect(
             user="root",
             password="taosdata",
-            host="localhost",
+            host=host,
-            port=6041,
+            port=port,
         )
+        print(f"Connected to {host}:{port} successfully.");
     except Exception as err:
-        print(err)
+        print(f"Failed to connect to {host}:{port} ; Err:{err}")
    
     return conn
-
+ # ANCHOR_END: connect
-# ANCHOR_END: connect
 
 def create_db_table(conn):
-    # ANCHOR: create_db
+# ANCHOR: create_db
     try:
         conn.execute("CREATE DATABASE IF NOT EXISTS power")
         conn.execute("USE power")
-        conn.execute(
+        conn.execute("CREATE STABLE IF NOT EXISTS meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (groupId INT, location BINARY(24))")
-            "CREATE STABLE IF NOT EXISTS meters (ts TIMESTAMP, current FLOAT, voltage INT, phase FLOAT) TAGS (groupId INT, location BINARY(24))")
         conn.execute("CREATE TABLE  IF NOT EXISTS `d0` USING `meters` (groupId, location) TAGS(0, 'Los Angles')")
     except Exception as err:
         print(f'Exception {err}')
-
-
 # ANCHOR_END: create_db
 
 def insert(conn):
-    # ANCHOR: insert
+# ANCHOR: insert
     sql = """
     INSERT INTO 
     power.d1001 USING power.meters TAGS('California.SanFrancisco', 2)
@@ -43,26 +42,22 @@ def insert(conn):
     """
     try:
         inserted = conn.execute(sql)
-        assert inserted == 4
+        assert inserted == 8
     except Exception as err:
-        print(f'Exception {err}')
+        print(f'Exception111 {err}')
-
-
 # ANCHOR_END: insert
 
 def query(conn):
-    # ANCHOR: query
+# ANCHOR: query
     try:
         result = conn.query("select * from meters")
         num_of_fields = result.field_count
-        print(f"query field conunt is {num_of_fields}")
+        print(num_of_fields)
 
         for row in result:
             print(row)
     except Exception as err:
-        print(f'query Exception {err}')
+        print(f'Exception {err}')
-
-
 # ANCHOR_END: query
 
 if __name__ == "__main__":

docs/examples/python/create_db_native.py

@@ -1,11 +1,13 @@
 import taos
 
 conn = None
+host = "localhost"
+port = 6030
 try:
-    conn = taos.connect(host="localhost",
+    conn = taos.connect(host=host,
+                        port=port,
                         user="root",
-                        password="taosdata",
+                        password="taosdata")
-                        port=6030)
 
     db = "power"
     # create database
@@ -27,7 +29,7 @@ try:
     assert rowsAffected == 0
 
 except Exception as err:
-    print(err) 
+    print(f"Failed to create db and table, db addrr:{host}:{port} err:{err}") 
 finally:
     if conn:
         conn.close()       

docs/examples/python/create_db_rest.py

@@ -1,8 +1,9 @@
 import taosrest
 
 conn = None
+url = "http://localhost:6041"
 try:
-    conn = taosrest.connect(url="http://localhost:6041",
+    conn = taosrest.connect(url=url,
                    user="root",
                    password="taosdata",
                    timeout=30)
@@ -22,7 +23,7 @@ try:
     assert rowsAffected == 0
 
 except Exception as err:
-    print(err)
+    print(f"Failed to create db and table, url:{url} err:{err}") 
 finally:
     if conn:
         conn.close()

docs/examples/python/create_db_ws.py

@@ -1,76 +1,35 @@
 import taosws
 
-db = "power"
+conn = None
-
+host = "localhost"
-def prepare():
+port = 6041
-    conn = None
+try:
-
-    try:
     conn = taosws.connect(user="root",
                           password="taosdata",
-                              host="192.168.1.98",
+                          host=host,
-                              port=6041)
+                          port=port)
-
 
+    db = "power"
     # create database
-        conn.execute(f"drop database if exists {db}")
+    rowsAffected = conn.execute(f"CREATE DATABASE IF NOT EXISTS {db}")
-        conn.execute(f"create database {db}")
+    assert rowsAffected == 0
-    except Exception as err:
+
-        print(err)
+    # change database. 
-    finally:
+    rowsAffected = conn.execute(f"USE {db}")
+    assert rowsAffected == 0
+    
+    # create super table
+    rowsAffected = conn.execute(
+        "CREATE TABLE IF NOT EXISTS `meters` (`ts` TIMESTAMP, `current` FLOAT, `voltage` INT, `phase` FLOAT) TAGS (`groupid` INT, `location` BINARY(16))"
+    )
+    assert rowsAffected == 0
+
+    # create table
+    rowsAffected = conn.execute("CREATE TABLE IF NOT EXISTS `d0` USING `meters` (groupid, location) TAGS(0, 'Los Angles')")
+    assert rowsAffected == 0
+
+except Exception as err:
+    print(f"Failed to create db and table, db addrr:{host}:{port} err:{err}") 
+finally:
     if conn:
         conn.close()
-
-def schemaless_insert():
-    conn = None
-
-    lineDemo = [
-        "meters,groupid=2,location=California.SanFrancisco current=10.3000002f64,voltage=219i32,phase=0.31f64 1626006833639"
-    ]
-
-    telnetDemo = ["metric_telnet 1707095283260 4 host=host0 interface=eth0"]
-
-    jsonDemo = [
-        '{"metric": "metric_json","timestamp": 1626846400,"value": 10.3, "tags": {"groupid": 2, "location": "California.SanFrancisco", "id": "d1001"}}'
-    ]
-
-    try:
-
-        conn = taosws.connect(user="root",
-                              password="taosdata",
-                              host="192.168.1.98",
-                              port=6041,
-                              database=db)
-
-        conn.schemaless_insert(
-            lines=lineDemo,
-            protocol=taosws.PySchemalessProtocol.Line,
-            precision=taosws.PySchemalessPrecision.Millisecond,
-            ttl=1,
-            req_id=1,
-        )
-
-        conn.schemaless_insert(
-            lines=telnetDemo,
-            protocol=taosws.PySchemalessProtocol.Telnet,
-            precision=taosws.PySchemalessPrecision.Microsecond,
-            ttl=1,
-            req_id=2,
-        )
-
-        conn.schemaless_insert(
-            lines=jsonDemo,
-            protocol=taosws.PySchemalessProtocol.Json,
-            precision=taosws.PySchemalessPrecision.Millisecond,
-            ttl=1,
-            req_id=3,
-        )
-    except Exception as err:
-        print(err)
-    finally:
-        if conn:
-            conn.close()
-
-if __name__ == '__main__':
-    prepare()
-    schemaless_insert()

docs/examples/python/query_native.py

@@ -20,7 +20,7 @@ try:
         print(row)
 
 except Exception as err:
-    print(err)
+    print(f"Failed to query data from power.meters, err:{err}")
 finally:
     if conn:
         conn.close()

docs/examples/python/query_rest.py

@@ -8,8 +8,8 @@ try:
                    password="taosdata",
                    timeout=30)
 
-    result = client.sql(f"SELECT ts, current, location FROM power.meters limit 100")
+    result = client.sql(f"SELECT ts, current, location FROM power.meters limit 100", 1)
     print(result)
 
 except Exception as err:
-    print(err)
+    print(f"Failed to query data from power.meters, err:{err}")

docs/examples/python/query_ws.py

@@ -16,7 +16,7 @@ try:
         print(row)
 
 except Exception as err:
-    print(err)
+    print(f"Failed to query data from power.meters, err:{err}")
 finally:
     if conn:
         conn.close()

docs/examples/python/reqid_native.py

@@ -7,19 +7,7 @@ try:
                         user="root",
                         password="taosdata")
 
-    sql = """
+    result = conn.query("SELECT ts, current, location FROM power.meters limit 100", 1)
-        INSERT INTO 
-        power.d1001 USING power.meters (groupid, location) TAGS(2, 'California.SanFrancisco')
-            VALUES (NOW + 1a, 10.30000, 219, 0.31000) 
-            (NOW + 2a, 12.60000, 218, 0.33000) (NOW + 3a, 12.30000, 221, 0.31000)
-        power.d1002 USING power.meters (groupid, location) TAGS(3, 'California.SanFrancisco') 
-            VALUES (NOW + 1a, 10.30000, 218, 0.25000)
-        """
-    affectedRows = conn.execute(sql, 1)
-    print(f"inserted into {affectedRows} rows to power.meters successfully.")
-
-    result = conn.query("SELECT ts, current, location FROM power.meters limit 100", 2)
-    print(result)
     # Get fields from result
     fields = result.fields
     for field in fields:
@@ -31,7 +19,7 @@ try:
         print(row)
 
 except Exception as err:
-    print(err)
+    print(f"Failed to execute sql with reqId, err:{err}")
 finally:
     if conn:
         conn.close()

docs/examples/python/reqid_rest.py

@@ -12,4 +12,4 @@ try:
     print(result)
 
 except Exception as err:
-    print(err)
+    print(f"Failed to execute sql with reqId, err:{err}")

docs/examples/python/reqid_ws.py

@@ -10,26 +10,13 @@ try:
         port=6041,
     )
 
-    sql = """
+    result = conn.query_with_req_id("SELECT ts, current, location FROM power.meters limit 100", req_id=1)
-        INSERT INTO 
-        power.d1001 USING power.meters (groupid, location) TAGS(2, 'California.SanFrancisco')
-            VALUES (NOW + 1a, 10.30000, 219, 0.31000) 
-            (NOW + 2a, 12.60000, 218, 0.33000) (NOW + 3a, 12.30000, 221, 0.31000)
-        power.d1002 USING power.meters (groupid, location) TAGS(3, 'California.SanFrancisco') 
-            VALUES (NOW + 1a, 10.30000, 218, 0.25000)
-        """
-    affectedRows = conn.execute_with_req_id(sql, req_id=1)
-    print(f"inserted into {affectedRows} rows to power.meters successfully.")
-
-    result = conn.query_with_req_id("SELECT ts, current, location FROM power.meters limit 100", req_id=2)
-    num_of_fields = result.field_count
-    print(num_of_fields)
 
     for row in result:
         print(row)
 
 except Exception as err:
-    print(err)
+    print(f"Failed to execute sql with reqId, err:{err}")
 finally:
     if conn:
         conn.close()

docs/examples/python/schemaless_native.py

@@ -32,7 +32,7 @@ try:
         jsonDemo, taos.SmlProtocol.JSON_PROTOCOL, taos.SmlPrecision.MILLI_SECONDS
     )
 except Exception as err:
-    print(err)
+    print(f"Failed to insert data with schemaless, err:{err}")
 finally:
     if conn:
         conn.close()

docs/examples/python/schemaless_ws.py

@@ -1,81 +1,47 @@
 import taosws
 
-db = "power"
+conn = None
 
-def prepare():
+lineDemo = [
-    conn = None
+    "meters,groupid=2,location=California.SanFrancisco current=10.3000002f64,voltage=219i32,phase=0.31f64 1626006833639"
+]
 
-    try:
+telnetDemo = ["metric_telnet 1707095283260 4 host=host0 interface=eth0"]
+
+jsonDemo = [
+    '{"metric": "metric_json","timestamp": 1626846400,"value": 10.3, "tags": {"groupid": 2, "location": "California.SanFrancisco", "id": "d1001"}}'
+]
+
+try:
     conn = taosws.connect(user="root",
                           password="taosdata",
-                              host="taosdata",
+                          host="localhost",
                           port=6041)
 
-
+    conn.execute("CREATE DATABASE IF NOT EXISTS power")
-        # create database
+    conn = conn.execute("USE power")
-        conn.execute(f"drop database if exists {db}")
-        conn.execute(f"create database {db}")
-    except Exception as err:
-        print(err)
-        raise err
-    finally:
-        if conn:
-            conn.close()
-
-def schemaless_insert():
-    conn = None
-
-    lineDemo = [
-        "meters,groupid=2,location=California.SanFrancisco current=10.3000002f64,voltage=219i32,phase=0.31f64 1626006833639"
-    ]
-
-    telnetDemo = ["metric_telnet 1707095283260 4 host=host0 interface=eth0"]
-
-    jsonDemo = [
-        '{"metric": "metric_json","timestamp": 1626846400,"value": 10.3, "tags": {"groupid": 2, "location": "California.SanFrancisco", "id": "d1001"}}'
-    ]
-
-    try:
-
-        conn = taosws.connect(user="root",
-                              password="taosdata",
-                              host="192.168.1.98",
-                              port=6041,
-                              database=db)
 
     conn.schemaless_insert(
         lines=lineDemo,
         protocol=taosws.PySchemalessProtocol.Line,
-            precision=taosws.PySchemalessPrecision.Millisecond,
+        precision=taosws.PySchemalessPrecision.Millisecond
-            ttl=1,
-            req_id=1,
     )
 
     conn.schemaless_insert(
         lines=telnetDemo,
         protocol=taosws.PySchemalessProtocol.Telnet,
-            precision=taosws.PySchemalessPrecision.Microsecond,
+        precision=taosws.PySchemalessPrecision.Microsecond
-            ttl=1,
-            req_id=2,
     )
 
     conn.schemaless_insert(
         lines=jsonDemo,
         protocol=taosws.PySchemalessProtocol.Json,
-            precision=taosws.PySchemalessPrecision.Millisecond,
+        precision=taosws.PySchemalessPrecision.Millisecond
-            ttl=1,
-            req_id=3,
     )
-    except Exception as err:
+except Exception as err:
-        print(err)
+    print(f"Failed to insert data with schemaless, err:{err}")
-        raise err
+            
-    finally:
+finally:
     if conn:
         conn.close()
 
-if __name__ == '__main__':
-    try:
-        prepare()
-        schemaless_insert()
-    except Exception as err:
-        print(err)

docs/examples/python/stmt_native.py

@@ -42,7 +42,7 @@ try:
         for j in range (numOfRow):
             timestamps.append(current + i)
             currents.append(random.random() * 30)
-            voltages.append(random.randint(100, 300))
+            voltages.append(random.random(100, 300))
             phases.append(random.random())
 
         params = taos.new_bind_params(4)
@@ -52,10 +52,11 @@ try:
         params[3].float(phases)
         stmt.bind_param_batch(params)
         stmt.execute()
-        print(f"table {tbname} insert ok.")
+        affected = stmt.affected_rows()
+        print(f"table {tbname} insert {affected} rows.")
 
 except Exception as err:
-    print(err)
+    print(f"Failed to insert to table meters using stmt, error: {err}") 
 finally:
     if stmt:
         stmt.close()

docs/examples/python/stmt_ws.py

@@ -38,10 +38,10 @@ try:
         currents = []
         voltages = []
         phases = []
-        for j in range(numOfRow):
+        for j in range (numOfRow):
             timestamps.append(current + i)
             currents.append(random.random() * 30)
-            voltages.append(random.randint(100, 300))
+            voltages.append(random.random(100, 300))
             phases.append(random.random())
 
         stmt.bind_param(
@@ -55,10 +55,10 @@ try:
 
         stmt.add_batch()
         rows = stmt.execute()
-        print(f"table {tbname} insert ok.")
+        print(f"insert {rows} rows.")
         
 except Exception as err:
-    print(err)
+    print(f"Failed to insert to table meters using stmt, error: {err}") 
 finally:
     if stmt:
         stmt.close()

docs/examples/python/tmq_native.py

@@ -1,6 +1,5 @@
 import taos
 
-
 def prepareMeta():
     conn = None
     try:
@@ -46,12 +45,9 @@ def prepareMeta():
         if conn:
             conn.close()
 
-        # ANCHOR: create_consumer
+# ANCHOR: create_consumer
-
-
 from taos.tmq import Consumer
 
-
 def create_consumer():
     try:
         consumer = Consumer(