Switch between versions of Python.

pyenv.bat

@rem remove any PYTHONHOME setting.
@set PYTHONHOME=

@rem first sets python path so we can run uniquepath.
@set PYTHON=C:\Python%1
@set PYTHONSTARTUP=%HOME%\scripts\startup.py
@dir %PYTHON% > NUL
@if ERRORLEVEL 1 GOTO FAILED

@set PATH=%PATH%;%PYTHON%
@rem Keep Python27 at the end of the PATH string to allow Vim to find Python27.dll
call uniquepath --remove *Python* --append %PYTHON% --append %PYTHON%\Scripts PATH --append %PYTHON%\Tools\Scripts --append C:\Python27
@goto SUCCESS

:FAILED
@echo %PYTHON% is not a valid directory.
@set ERRORLEVEL=1

:SUCCESS
@rem Keep pylint directory local.
@SET PYLINTHOME=pylint.d

@exit /B %ERRORLEVEL%