_env = os.environ
_PYTHONPATH = 'PYTHONPATH'

def get_python(py3=False):
    env = dict(_env)
    env.pop(_PYTHONPATH, None)
    pyexe = 'python2' if not py3 else 'python3'
    import subprocess as sub
    p = sub.Popen(pyexe, env=env, stdin=sub.PIPE, stdout=sub.PIPE, stderr=sub.PIPE, universal_newlines=True)
    p.stdin.write('import sys\n')
    p.stdin.write('print("EXEC|" + sys.executable)\n')
    p.stdin.write('print("PATH|" + "|".join(sys.path))\n')
    p.stdin.write('import os\n')
    p.stdin.write('if sys.platform == "win32":\n')
    p.stdin.write('    key = "PATH"\n')
    p.stdin.write('elif sys.platform == "darwin":\n')
    p.stdin.write('    key = "DYLD_LIBRARY_PATH"\n')
    p.stdin.write('else:\n')
    p.stdin.write('    key = "LD_LIBRARY_PATH"\n')
    p.stdin.write('lp = os.environ[key].split(os.pathsep)\n')
    p.stdin.write('print("LDPATH|" + "|".join(lp))\n')
    p.stdin.close()
    exe, path, ldpath = parse_for_env(p.stdout, sep='|')
    if exe is None:
        raise RuntimeError('Problem with running external process: ' + p.stderr.read())
    return exe, path, ldpath


print get_python()