anchor.diff:  rem * ================= 
   if exist  "%WINPYDIR%\Lib\site-packages\voila" "%WINPYDIR%\Scripts\jupyter.exe" serverextension enable voila --sys-prefix
   
  -
  -rem * ==================
  -echo  install of pydeck (2020-02-02)
  -rem * ================= 
  -if exist  "%WINPYDIR%\Lib\site-packages\pydeck" "%WINPYDIR%\Scripts\jupyter.exe" nbextension enable --py --sys-prefix pydeck
  -
  -
  -rem * ==================
  -echo  install of labextension install dask-labextension (2020-02-05)
  -rem * ================= 
  -rem no more if exist  "%WINPYDIR%\Lib\site-packages\dask_labextension" "%WINPYDIR%\Scripts\jupyter.exe" serverextension enable dask_labextension 
  -
  -
  -rem * ==================
  -echo finish install of ipygany (2020-12-29)
  -rem * ================= 
  -if exist  "%WINPYDIR%\Lib\site-packages\ipygany" "%WINPYDIR%\Scripts\jupyter.exe" nbextension enable --py --sys-prefix ipygany
   
   rem * =================
   echo finish install seaborn iris example
  
positive.code: if not exist "%WINPYDIR%\Lib\site-packages\mingwpy" echo [config]>%pydistutils_cfg%
  
  
  
  @echo off
  rem * ===========================
  echo finish install of jupyterlab
  rem * ===========================
  
  rem 2020-04-10 security
  rem if exist  "%WINPYDIR%\Lib\site-packages\jupyterlab"  "%WINPYDIR%\..\n\npm" config set ignore-scripts true
  
  rem other suggestion from https://github.com/nteract/nteract
  rem npm install -g --production windows-build-tools
  
  
  @echo on
  rem * ===================
  echo jupyterlab pre-clean meaningless in 3.0
  rem * ==================
  @echo off
  rem pre-clean Whatever jupyterlab version
  rem if exist  "%WINPYDIR%\Lib\site-packages\jupyterlab"  "%WINPYDIR%\Scripts\jupyter.exe" lab clean
  
  
  rem * ==================
  echo finish install of ipydatawidgets (2018-03-10)
  rem * ================= 
  if exist  "%WINPYDIR%\Lib\site-packages\ipydatawidgets" "%WINPYDIR%\Scripts\jupyter.exe" nbextension install --py --sys-prefix  ipydatawidgets
  if exist  "%WINPYDIR%\Lib\site-packages\ipydatawidgets" "%WINPYDIR%\Scripts\jupyter.exe" nbextension enable --py  --sys-prefix  ipydatawidgets
  
  
  rem * ==================
  echo finish install of ipyvolume / ipywebrtc
  rem * =================
  if exist  "%WINPYDIR%\Lib\site-packages\ipywebrtc" "%WINPYDIR%\Scripts\jupyter.exe" nbextension enable --py  --sys-prefix  ipywebrtc
  if exist  "%WINPYDIR%\Lib\site-packages\ipyvolume" "%WINPYDIR%\Scripts\jupyter.exe" nbextension enable --py  --sys-prefix  ipyvolume
  
  
  rem * ==================
  echo finish install of pdvega
  rem * =================
  if exist  "%WINPYDIR%\Lib\site-packages\vega3" "%WINPYDIR%\Scripts\jupyter.exe" nbextension enable --py --sys-prefix vega3
  
  
  rem * ==================
  echo finish install of rise
  rem * =================
  if exist  "%WINPYDIR%\Lib\site-packages\rise" "%WINPYDIR%\Scripts\jupyter.exe" nbextension install rise --py --sys-prefix
  if exist  "%WINPYDIR%\Lib\site-packages\rise" "%WINPYDIR%\Scripts\jupyter.exe" nbextension enable --py --sys-prefix rise 
  
  
  rem * ==================
  echo finish install of nteract_on_jupyter (2018-12-27)
  rem * ================= 
  
negative.code: echo clear jupyterlab staging (2018-03-09)
  rem * ===================
  if exist "%WINPYDIR%\share\jupyter\lab\staging" rmdir /S /Q "%WINPYDIR%\share\jupyter\lab\staging"
  rem if exist  "%WINPYDIR%\Lib\site-packages\jupyterlab"  "%WINPYDIR%\Scripts\jupyter.exe" lab clean
  
  
  echo 2019-10-22 Spyder tweaks moved at the end as suspicion of problem creating (on Python-3.8)
  rem * ============================
  