anchor.diff:  )
   set THIRD_PARTY_HOME=%cache_dir:\=/%/third_party/%sub_dir%
   set THIRD_PARTY_PATH=%THIRD_PARTY_HOME%/%md5%
  -set UPLOAD_TP_FILE=OFF
   
   if not exist %THIRD_PARTY_PATH% (
       echo There is no usable third_party cache in %THIRD_PARTY_PATH%, will download from bos.
  
positive.code:     )
  )
  
  set BCE_FILE=%cache_dir%\bce-python-sdk-0.8.33\BosClient.py
  if %UPLOAD_TP_FILE%==ON (
      echo Uploading third_party: checking bce ...
      if not exist %cache_dir%\bce-python-sdk-0.8.33 (
          echo There is no bce in this PC, will install bce.
  
negative.code: if not defined PYTHON_ROOT set PYTHON_ROOT=C:\Python37
  if not defined BUILD_DIR set BUILD_DIR=build
  set task_name=%1
  set UPLOAD_TP_FILE=OFF
  
  rem ------initialize the python environment------
  set PYTHON_EXECUTABLE=%PYTHON_ROOT%\python.exe
  