Terry J. Reedy added the comment:

There already is an idlelib/idle.bat that starts the corresponding python with

set CURRDIR=%~dp0
start "IDLE" "%CURRDIR%..\..\pythonw.exe" "%CURRDIR%idle.pyw" %1 %2 %3 %4 %5 %6 
%7 %8 %9

Arguments added to the .bat command are passed on. So the enhancement requested 
already exists.

C:\Programs>python34\lib\idlelib\idle.bat, for instance, starts 3.4, and 
changing '34' to '33' or '27' starts 3.3 or 2.7.

python -E ignores PYTHON* environment variables. Unfortunately, this seems to 
prevent python from running idle. Adding -E to the above or directly to
C:\Programs\Python34>pythonw.exe Lib/idlelib/idle.pyw -E
results in a new prompts with no visible action. Since I do not have any 
PYTHON* vars to ignore, this puzzle me. Does this indicate a bug in the startup 
handling of -E? (Nick?)

Except for this puzzle, I would close this as a third party issue.

----------
nosy: +ncoghlan

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<http://bugs.python.org/issue15780>
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