anchor.diff:  
   :: if it can't be activated, create it
   :create
  -CALL conda create -n %env_name% --file conda_versions.txt
  -:: don't CALL pip if conda runs into trouble
  +CALL conda create -n %env_name% python=3.5 --file conda_versions.txt
  +:: don't call pip if conda runs into trouble
   IF %ERRORLEVEL% GEQ 1 EXIT /B 2
  -:: CALL pip if we have pip requirements
  +:: call pip if we have pip requirements
   IF exist requirements.txt (
       CALL activate %env_name%
       CALL pip install -r requirements.txt
  
positive.code: IF /i "%1" == "create" GOTO create
  IF /i "%1" == "install" GOTO create
  IF /i "%1" == "update" GOTO update
  IF %ERRORLEVEL% GEQ 1 GOTO create
  
  GOTO :EOF
  
negative.code: CALL picky --update
  )
  
  :picky
  CALL picky
  GOTO :EOF
  
  GOTO :EOF