on a system w/o python3

[Skaperen]

to start with, i need to change all the hash-bang references back to just plain python (from python3). for those scripts that work better on python3 i add code (running on python2) that checks for the existence of python3, and if it does exit, switch over to python3, which most likely will mean something like:

if sys.version_info.major<3:
    for p in os.environ.get('PATH','').split(':'):
        if p and os.path.exists(p+'/python3'):
            os.execvp('python3',['python3']+sys.argv)

or maybe

if sys.version_info.major<3:
    for p in os.environ.get('PATH','').split(':'):
        if p and os.path.exists(p+'/python3'):
            os.execvp(p+'/python3',['python3']+sys.argv)

where the difference is the 1st argument in the call to os.execvp

anyone know of a way, at least in Linux, in python2, to get the full path of the interpreter being used?

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so in Windows does Windows support the #! or does Python.  when a script is run in Windows, what decides which interpreter starts first?  if Python is interpreting the #! can it handle other language interpreters if it is the first interpreter to start?