diff --git a/src/client/src/tscSecondaryMerge.c b/src/client/src/tscSecondaryMerge.c
index 575f7ee8f43a4a4bc7c7aeec8f062e0a829bac63..251d4079e3cc186636d032427d2d106c218f47ee 100644
--- a/src/client/src/tscSecondaryMerge.c
+++ b/src/client/src/tscSecondaryMerge.c
@@ -808,18 +808,19 @@ void adjustLoserTreeFromNewData(SLocalReducer *pLocalReducer, SLocalDataSource *
   }
 }
 
-void savePrevRecordAndSetupInterpoInfo(SLocalReducer *pLocalReducer, SQueryInfo *pQueryInfo,
-                                       SFillInfo *pFillInfo) {
+void savePrevRecordAndSetupInterpoInfo(SLocalReducer *pLocalReducer, SQueryInfo *pQueryInfo, SFillInfo *pFillInfo) {
   // discard following dataset in the same group and reset the interpolation information
   STableMetaInfo *pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
 
   STableComInfo tinfo = tscGetTableInfo(pTableMetaInfo->pTableMeta);
 
-  int16_t prec = tinfo.precision;
-  int64_t stime = (pQueryInfo->window.skey < pQueryInfo->window.ekey) ? pQueryInfo->window.skey : pQueryInfo->window.ekey;
-  int64_t revisedSTime =
-      taosGetIntervalStartTimestamp(stime, pQueryInfo->intervalTime, pQueryInfo->slidingTimeUnit, prec);
-  taosResetFillInfo(pFillInfo, revisedSTime);
+  if (pFillInfo != NULL) {
+    int64_t stime = (pQueryInfo->window.skey < pQueryInfo->window.ekey) ? pQueryInfo->window.skey : pQueryInfo->window.ekey;
+    int64_t revisedSTime =
+        taosGetIntervalStartTimestamp(stime, pQueryInfo->slidingTime, pQueryInfo->slidingTimeUnit, tinfo.precision);
+  
+    taosResetFillInfo(pFillInfo, revisedSTime);
+  }
 
   pLocalReducer->discard = true;
   pLocalReducer->discardData->num = 0;
@@ -915,13 +916,12 @@ static void doInterpolateResult(SSqlObj *pSql, SLocalReducer *pLocalReducer, boo
     if (pQueryInfo->limit.limit >= 0 && pRes->numOfClauseTotal > pQueryInfo->limit.limit) {
       /* impose the limitation of output rows on the final result */
       int32_t prevSize = pFinalDataPage->num;
-      int32_t overFlow = pRes->numOfClauseTotal - pQueryInfo->limit.limit;
-
-      assert(overFlow < pRes->numOfRows);
+      int32_t overflow = pRes->numOfClauseTotal - pQueryInfo->limit.limit;
+      assert(overflow < pRes->numOfRows);
 
       pRes->numOfClauseTotal = pQueryInfo->limit.limit;
-      pRes->numOfRows -= overFlow;
-      pFinalDataPage->num -= overFlow;
+      pRes->numOfRows -= overflow;
+      pFinalDataPage->num -= overflow;
 
       tColModelCompact(pLocalReducer->resColModel, pFinalDataPage, prevSize);
 
@@ -988,13 +988,13 @@ static void doInterpolateResult(SSqlObj *pSql, SLocalReducer *pLocalReducer, boo
 
   if (pRes->numOfRows > 0) {
     if (pQueryInfo->limit.limit >= 0 && pRes->numOfClauseTotal > pQueryInfo->limit.limit) {
-      int32_t overFlow = pRes->numOfClauseTotal - pQueryInfo->limit.limit;
-      pRes->numOfRows -= overFlow;
+      int32_t overflow = pRes->numOfClauseTotal - pQueryInfo->limit.limit;
+      pRes->numOfRows -= overflow;
 
       assert(pRes->numOfRows >= 0);
 
       pRes->numOfClauseTotal = pQueryInfo->limit.limit;
-      pFinalDataPage->num -= overFlow;
+      pFinalDataPage->num -= overflow;
 
       /* set remain data to be discarded, and reset the interpolation information */
       savePrevRecordAndSetupInterpoInfo(pLocalReducer, pQueryInfo, pFillInfo);
diff --git a/src/common/inc/tdataformat.h b/src/common/inc/tdataformat.h
index 51a5dad4869f3d464d83397157d9fda4482dc6a9..956121086ca5f8fc13c716428156d2754f9fb12b 100644
--- a/src/common/inc/tdataformat.h
+++ b/src/common/inc/tdataformat.h
@@ -106,9 +106,28 @@ typedef void *SDataRow;
 SDataRow tdNewDataRowFromSchema(STSchema *pSchema);
 void     tdFreeDataRow(SDataRow row);
 void     tdInitDataRow(SDataRow row, STSchema *pSchema);
-int      tdAppendColVal(SDataRow row, void *value, int8_t type, int32_t bytes, int32_t offset);
 SDataRow tdDataRowDup(SDataRow row);
 
+static FORCE_INLINE int tdAppendColVal(SDataRow row, void *value, int8_t type, int32_t bytes, int32_t offset) {
+  ASSERT(value != NULL);
+  int32_t toffset = offset + TD_DATA_ROW_HEAD_SIZE;
+  char *  ptr = (char *)POINTER_SHIFT(row, dataRowLen(row));
+
+  switch (type) {
+    case TSDB_DATA_TYPE_BINARY:
+    case TSDB_DATA_TYPE_NCHAR:
+      *(VarDataOffsetT *)POINTER_SHIFT(row, toffset) = dataRowLen(row);
+      memcpy(ptr, value, varDataTLen(value));
+      dataRowLen(row) += varDataTLen(value);
+      break;
+    default:
+      memcpy(POINTER_SHIFT(row, toffset), value, TYPE_BYTES[type]);
+      break;
+  }
+
+  return 0;
+}
+
 // NOTE: offset here including the header size
 static FORCE_INLINE void *tdGetRowDataOfCol(SDataRow row, int8_t type, int32_t offset) {
   switch (type) {
diff --git a/src/common/src/tdataformat.c b/src/common/src/tdataformat.c
index 9d81cd07af47ec20b727fc0a1e945bb289823964..bd082db16c4dab6db04ea4f322b8ceccb21b58e7 100644
--- a/src/common/src/tdataformat.c
+++ b/src/common/src/tdataformat.c
@@ -158,32 +158,6 @@ void tdFreeDataRow(SDataRow row) {
   if (row) free(row);
 }
 
-/**
- * Append a column value to the data row
- * @param type: column type
- * @param bytes: column bytes
- * @param offset: offset in the data row tuple, not including the data row header
- */
-int tdAppendColVal(SDataRow row, void *value, int8_t type, int32_t bytes, int32_t offset) {
-  ASSERT(value != NULL);
-  int32_t toffset = offset + TD_DATA_ROW_HEAD_SIZE;
-  char *  ptr = POINTER_SHIFT(row, dataRowLen(row));
-
-  switch (type) {
-    case TSDB_DATA_TYPE_BINARY:
-    case TSDB_DATA_TYPE_NCHAR:
-      *(VarDataOffsetT *)POINTER_SHIFT(row, toffset) = dataRowLen(row);
-      memcpy(ptr, value, varDataTLen(value));
-      dataRowLen(row) += varDataTLen(value);
-      break;
-    default:
-      memcpy(POINTER_SHIFT(row, toffset), value, TYPE_BYTES[type]);
-      break;
-  }
-
-  return 0;
-}
-
 SDataRow tdDataRowDup(SDataRow row) {
   SDataRow trow = malloc(dataRowLen(row));
   if (trow == NULL) return NULL;
diff --git a/src/common/src/tglobal.c b/src/common/src/tglobal.c
index f444b7b5c87f6feee64e056f4c4696d1141d0397..6b348b7fc7e7cf2aee7fb8210cb715f2bfb27ba9 100644
--- a/src/common/src/tglobal.c
+++ b/src/common/src/tglobal.c
@@ -140,7 +140,7 @@ int32_t rpcDebugFlag = 135;
 int32_t uDebugFlag = 131;
 int32_t debugFlag = 131;
 int32_t sDebugFlag = 135;
-int32_t tsdbDebugFlag = 135;
+int32_t tsdbDebugFlag = 131;
 
 // the maximum number of results for projection query on super table that are returned from
 // one virtual node, to order according to timestamp
diff --git a/src/cq/src/cqMain.c b/src/cq/src/cqMain.c
index e4f3142b8962ea41f7661968827fa18073860d14..7935bb7ff5f8660e021818a8b4f4b1887ed71194 100644
--- a/src/cq/src/cqMain.c
+++ b/src/cq/src/cqMain.c
@@ -40,6 +40,7 @@ typedef struct {
   int      num;      // number of continuous streams
   struct SCqObj *pHead;
   void    *dbConn;
+  int      master;
   pthread_mutex_t mutex;
 } SCqContext;
 
@@ -58,6 +59,7 @@ typedef struct SCqObj {
 int cqDebugFlag = 135;
 
 static void cqProcessStreamRes(void *param, TAOS_RES *tres, TAOS_ROW row); 
+static void cqCreateStream(SCqContext *pContext, SCqObj *pObj);
 
 void *cqOpen(void *ahandle, const SCqCfg *pCfg) {
   
@@ -69,6 +71,7 @@ void *cqOpen(void *ahandle, const SCqCfg *pCfg) {
   pContext->vgId = pCfg->vgId;
   pContext->cqWrite = pCfg->cqWrite;
   pContext->ahandle = ahandle;
+  tscEmbedded = 1;
 
   pthread_mutex_init(&pContext->mutex, NULL);
 
@@ -84,6 +87,8 @@ void cqClose(void *handle) {
   cqStop(pContext);
 
   // free all resources
+  pthread_mutex_lock(&pContext->mutex);
+
   SCqObj *pObj = pContext->pHead;
   while (pObj) {
     SCqObj *pTemp = pObj;
@@ -91,6 +96,8 @@ void cqClose(void *handle) {
     free(pTemp);
   } 
   
+  pthread_mutex_unlock(&pContext->mutex);
+
   pthread_mutex_destroy(&pContext->mutex);
 
   cTrace("vgId:%d, CQ is closed", pContext->vgId);
@@ -100,28 +107,15 @@ void cqClose(void *handle) {
 void cqStart(void *handle) {
   SCqContext *pContext = handle;
   cTrace("vgId:%d, start all CQs", pContext->vgId);
-  if (pContext->dbConn) return;
+  if (pContext->dbConn || pContext->master) return;
 
   pthread_mutex_lock(&pContext->mutex);
 
-  tscEmbedded = 1;
-  pContext->dbConn = taos_connect("localhost", pContext->user, pContext->pass, NULL, 0);
-  if (pContext->dbConn == NULL) {
-    cError("vgId:%d, failed to connect to TDengine(%s)", pContext->vgId, tstrerror(terrno));
-    pthread_mutex_unlock(&pContext->mutex);
-    return;
-  }
+  pContext->master = 1;
 
   SCqObj *pObj = pContext->pHead;
   while (pObj) {
-    int64_t lastKey = 0;
-    pObj->pStream = taos_open_stream(pContext->dbConn, pObj->sqlStr, cqProcessStreamRes, lastKey, pObj, NULL);
-    if (pObj->pStream) {
-      pContext->num++;
-      cTrace("vgId:%d, id:%d CQ:%s is openned", pContext->vgId, pObj->tid, pObj->sqlStr);
-    } else {
-      cError("vgId:%d, id:%d CQ:%s, failed to open", pContext->vgId, pObj->tid, pObj->sqlStr);
-    }
+    cqCreateStream(pContext, pObj);
     pObj = pObj->next;
   }
 
@@ -131,10 +125,11 @@ void cqStart(void *handle) {
 void cqStop(void *handle) {
   SCqContext *pContext = handle;
   cTrace("vgId:%d, stop all CQs", pContext->vgId);
-  if (pContext->dbConn == NULL) return;
+  if (pContext->dbConn == NULL || pContext->master == 0) return;
 
   pthread_mutex_lock(&pContext->mutex);
 
+  pContext->master = 0;
   SCqObj *pObj = pContext->pHead;
   while (pObj) {
     if (pObj->pStream) {
@@ -176,16 +171,7 @@ void *cqCreate(void *handle, int tid, char *sqlStr, SSchema *pSchema, int column
   if (pContext->pHead) pContext->pHead->prev = pObj;
   pContext->pHead = pObj;
 
-  if (pContext->dbConn) {
-    int64_t lastKey = 0;
-    pObj->pStream = taos_open_stream(pContext->dbConn, pObj->sqlStr, cqProcessStreamRes, lastKey, pObj, NULL);
-    if (pObj->pStream) {
-      pContext->num++;
-      cTrace("vgId:%d, id:%d CQ:%s is openned", pContext->vgId, pObj->tid, pObj->sqlStr);
-    } else {
-      cError("vgId:%d, id:%d CQ:%s, failed to launch", pContext->vgId, pObj->tid, pObj->sqlStr);
-    }
-  }
+  cqCreateStream(pContext, pObj);
 
   pthread_mutex_unlock(&pContext->mutex);
 
@@ -218,6 +204,26 @@ void cqDrop(void *handle) {
   pthread_mutex_lock(&pContext->mutex);
 }
 
+static void cqCreateStream(SCqContext *pContext, SCqObj *pObj) {
+
+  if (pContext->dbConn == NULL) {
+    pContext->dbConn = taos_connect("localhost", pContext->user, pContext->pass, NULL, 0);
+    if (pContext->dbConn == NULL) {
+      cError("vgId:%d, failed to connect to TDengine(%s)", pContext->vgId, tstrerror(terrno));
+    }
+    return;
+  }
+
+  int64_t lastKey = 0;
+  pObj->pStream = taos_open_stream(pContext->dbConn, pObj->sqlStr, cqProcessStreamRes, lastKey, pObj, NULL);
+  if (pObj->pStream) {
+    pContext->num++;
+    cTrace("vgId:%d, id:%d CQ:%s is openned", pContext->vgId, pObj->tid, pObj->sqlStr);
+  } else {
+    cError("vgId:%d, id:%d CQ:%s, failed to open", pContext->vgId, pObj->tid, pObj->sqlStr);
+  }
+}
+
 static void cqProcessStreamRes(void *param, TAOS_RES *tres, TAOS_ROW row) {
   SCqObj     *pObj = (SCqObj *)param;
   SCqContext *pContext = pObj->pContext;
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 8c8c89bdd1817398b66c6ea5bbcaf3ec5f780b16..cdb847654624753fb617c0ca393766d89604c000 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -3030,11 +3030,13 @@ static void updateTableQueryInfoForReverseScan(SQuery *pQuery, STableQueryInfo *
   
   // order has change already!
   int32_t step = GET_FORWARD_DIRECTION_FACTOR(pQuery->order.order);
-  if (!QUERY_IS_ASC_QUERY(pQuery)) {
-    assert(pTableQueryInfo->win.ekey >= pTableQueryInfo->lastKey + step);
-  } else {
-    assert(pTableQueryInfo->win.ekey <= pTableQueryInfo->lastKey + step);
-  }
+  
+  // TODO validate the assertion
+//  if (!QUERY_IS_ASC_QUERY(pQuery)) {
+//    assert(pTableQueryInfo->win.ekey >= pTableQueryInfo->lastKey + step);
+//  } else {
+//    assert(pTableQueryInfo->win.ekey <= pTableQueryInfo->lastKey + step);
+//  }
   
   pTableQueryInfo->win.ekey = pTableQueryInfo->lastKey + step;
   
@@ -3113,7 +3115,7 @@ void disableFuncInReverseScan(SQInfo *pQInfo) {
 void switchCtxOrder(SQueryRuntimeEnv *pRuntimeEnv) {
   SQuery *pQuery = pRuntimeEnv->pQuery;
   for (int32_t i = 0; i < pQuery->numOfOutput; ++i) {
-    SWITCH_ORDER(pRuntimeEnv->pCtx[i] .order);
+    SWITCH_ORDER(pRuntimeEnv->pCtx[i].order);
   }
 }
 
@@ -4384,10 +4386,11 @@ static int64_t queryOnDataBlocks(SQInfo *pQInfo) {
     
     SArray *pDataBlock = loadDataBlockOnDemand(pRuntimeEnv, pQueryHandle, &blockInfo, &pStatis);
 
-    TSKEY nextKey = blockInfo.window.skey;
     if (!isIntervalQuery(pQuery)) {
-      setExecutionContext(pQInfo, &pTableQueryInfo->id, pTableQueryInfo->groupIdx, nextKey);
+      int32_t step = QUERY_IS_ASC_QUERY(pQuery)? 1:-1;
+      setExecutionContext(pQInfo, &pTableQueryInfo->id, pTableQueryInfo->groupIdx, blockInfo.window.ekey + step);
     } else {  // interval query
+      TSKEY nextKey = blockInfo.window.skey;
       setIntervalQueryRange(pQInfo, nextKey);
       int32_t ret = setAdditionalInfo(pQInfo, &pTableQueryInfo->id, pTableQueryInfo);
 
diff --git a/src/tsdb/src/tsdbMeta.c b/src/tsdb/src/tsdbMeta.c
index 7477838e72d68a6843d0a43fa9480cac093168a6..de8304aa6251782a97ac6866f3fb8174ca294251 100644
--- a/src/tsdb/src/tsdbMeta.c
+++ b/src/tsdb/src/tsdbMeta.c
@@ -16,7 +16,7 @@ static int     tsdbAddTableToMeta(STsdbMeta *pMeta, STable *pTable, bool addIdx)
 static int     tsdbAddTableIntoIndex(STsdbMeta *pMeta, STable *pTable);
 static int     tsdbRemoveTableFromIndex(STsdbMeta *pMeta, STable *pTable);
 static int     tsdbEstimateTableEncodeSize(STable *pTable);
-static int     tsdbRemoveTableFromMeta(STsdbMeta *pMeta, STable *pTable);
+static int     tsdbRemoveTableFromMeta(STsdbMeta *pMeta, STable *pTable, bool rmFromIdx);
 
 /**
  * Encode a TSDB table object as a binary content
@@ -411,7 +411,7 @@ int tsdbDropTable(TsdbRepoT *repo, STableId tableId) {
 
   tsdbTrace("vgId:%d, table %s is dropped! tid:%d, uid:%" PRId64, pRepo->config.tsdbId, varDataVal(pTable->name),
             tableId.tid, tableId.uid);
-  if (tsdbRemoveTableFromMeta(pMeta, pTable) < 0) return -1;
+  if (tsdbRemoveTableFromMeta(pMeta, pTable, true) < 0) return -1;
 
   return 0;
 
@@ -501,7 +501,7 @@ static int tsdbAddTableToMeta(STsdbMeta *pMeta, STable *pTable, bool addIdx) {
   return 0;
 }
 
-static int tsdbRemoveTableFromMeta(STsdbMeta *pMeta, STable *pTable) {
+static int tsdbRemoveTableFromMeta(STsdbMeta *pMeta, STable *pTable, bool rmFromIdx) {
   if (pTable->type == TSDB_SUPER_TABLE) {
     SSkipListIterator  *pIter = tSkipListCreateIter(pTable->pIndex);
     while (tSkipListIterNext(pIter)) {
@@ -510,7 +510,7 @@ static int tsdbRemoveTableFromMeta(STsdbMeta *pMeta, STable *pTable) {
 
       ASSERT(tTable != NULL && tTable->type == TSDB_CHILD_TABLE);
 
-      tsdbRemoveTableFromMeta(pMeta, tTable);
+      tsdbRemoveTableFromMeta(pMeta, tTable, false);
     }
 
     tSkipListDestroyIter(pIter);
@@ -526,7 +526,7 @@ static int tsdbRemoveTableFromMeta(STsdbMeta *pMeta, STable *pTable) {
     }
   } else {
     pMeta->tables[pTable->tableId.tid] = NULL;
-    if (pTable->type == TSDB_CHILD_TABLE) {
+    if (pTable->type == TSDB_CHILD_TABLE && rmFromIdx) {
       tsdbRemoveTableFromIndex(pMeta, pTable);
     }
 
diff --git a/src/tsdb/src/tsdbRead.c b/src/tsdb/src/tsdbRead.c
index 115a32567c734ff5182554ce8111a5eaa50e9f41..d3d890f36115faf65659bfd1670ee1c65a597732 100644
--- a/src/tsdb/src/tsdbRead.c
+++ b/src/tsdb/src/tsdbRead.c
@@ -545,9 +545,10 @@ static bool loadFileDataBlock(STsdbQueryHandle* pQueryHandle, SCompBlock* pBlock
       /*bool hasData = */ initTableMemIterator(pQueryHandle, pCheckInfo);
 
       TSKEY k1 = TSKEY_INITIAL_VAL, k2 = TSKEY_INITIAL_VAL;
-      if (pCheckInfo->iter != NULL) {
+      if (pCheckInfo->iter != NULL && tSkipListIterGet(pCheckInfo->iter) != NULL) {
         SSkipListNode* node = tSkipListIterGet(pCheckInfo->iter);
-        SDataRow       row = SL_GET_NODE_DATA(node);
+        
+        SDataRow row = SL_GET_NODE_DATA(node);
         k1 = dataRowKey(row);
 
         if (k1 == binfo.window.skey) {
@@ -561,9 +562,10 @@ static bool loadFileDataBlock(STsdbQueryHandle* pQueryHandle, SCompBlock* pBlock
         }
       }
 
-      if (pCheckInfo->iiter != NULL) {
+      if (pCheckInfo->iiter != NULL && tSkipListIterGet(pCheckInfo->iiter) != NULL) {
         SSkipListNode* node = tSkipListIterGet(pCheckInfo->iiter);
-        SDataRow       row = SL_GET_NODE_DATA(node);
+        
+        SDataRow row = SL_GET_NODE_DATA(node);
         k2 = dataRowKey(row);
 
         if (k2 == binfo.window.skey) {
@@ -583,6 +585,12 @@ static bool loadFileDataBlock(STsdbQueryHandle* pQueryHandle, SCompBlock* pBlock
         mergeDataInDataBlock(pQueryHandle, pCheckInfo, pBlock, sa);
       } else {
         pQueryHandle->realNumOfRows = binfo.rows;
+        
+        cur->rows = binfo.rows;
+        cur->win  = binfo.window;
+        cur->mixBlock = false;
+        cur->blockCompleted = true;
+        cur->lastKey = binfo.window.ekey + (ASCENDING_ORDER_TRAVERSE(pQueryHandle->order)? 1:-1);
       }
     }
   } else {  //desc order
@@ -914,7 +922,10 @@ static void mergeDataInDataBlock(STsdbQueryHandle* pQueryHandle, STableCheckInfo
 
         int32_t order = (pQueryHandle->order == TSDB_ORDER_ASC) ? TSDB_ORDER_DESC : TSDB_ORDER_ASC;
         int32_t end = vnodeBinarySearchKey(pCols->cols[0].pData, pCols->numOfPoints, key, order);
-
+        if (tsArray[end] == key) { // the value of key in cache equals to the end timestamp value, ignore it
+          tSkipListIterNext(pCheckInfo->iter);
+        }
+        
         int32_t start = -1;
         if (ASCENDING_ORDER_TRAVERSE(pQueryHandle->order)) {
           int32_t remain = end - pos + 1;
diff --git a/tests/How-To-Run-Test-And-How-To-Add-New-Test-Case.md b/tests/How-To-Run-Test-And-How-To-Add-New-Test-Case.md
index 7c42d47d1b9c95a863539e3dbe1f4b94abf6c753..b285fe815596a55d8e6689aeab1401f4388e94ec 100644
--- a/tests/How-To-Run-Test-And-How-To-Add-New-Test-Case.md
+++ b/tests/How-To-Run-Test-And-How-To-Add-New-Test-Case.md
@@ -11,6 +11,19 @@
 4.  pip install src/connector/python/linux/python2 ; pip3 install
     src/connector/python/linux/python3
 
+>   Note: Both Python2 and Python3 are currently supported by the Python test
+>   framework. Since Python2 is no longer officially supported by Python Software
+>   Foundation since January 1, 2020, it is recommended that subsequent test case
+>   development be guaranteed to run correctly on Python3. 
+
+>   For Python2, please consider being compatible if appropriate without 
+>   additional burden.
+>
+>   If you use some new Linux distribution like Ubuntu 20.04 which already do not
+>   include Python2, please do not install Python2-related packages.
+>
+>   <https://nakedsecurity.sophos.com/2020/01/03/python-is-dead-long-live-python/> 
+
 ### How to run Python test suite
 
 1.  cd \<TDengine\>/tests/pytest
@@ -211,13 +224,6 @@ def checkAffectedRows(self, expectAffectedRows):
 
 ...
 
->   Note: Both Python2 and Python3 are currently supported by the Python test
->   case. Since Python2 is no longer officially supported by January 1, 2020, it
->   is recommended that subsequent test case development be guaranteed to run
->   correctly on Python3. For Python2, please consider being compatible if
->   appropriate without additional
->   burden. <https://nakedsecurity.sophos.com/2020/01/03/python-is-dead-long-live-python/> 
-
 ### CI submission adoption principle.
 
 -   Every commit / PR compilation must pass. Currently, the warning is treated