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5073090a20
Following some inconsistencies occurred during by developments, and in the light of #6508, it decided to wrote a PR that will take fully advantage of the conversion from bash to python to the development setup tools. This PR adresses several issues when trying to use the development setup tools (`tools/venv.py` and `tools/venv3.py`: * on Windows, `python` executable is not always in PATH (default behavior) * even if the option is checked, the `python` executable is not associated to the usually symlink `python3` on Windows * on Windows again, really powerful introspection of the available Python environments can be done with `py`, the Windows Python launcher * in general for all systems, `tools/venv.py` and `tools/venv3.py` ensures that the respective Python major version will be used to setup the virtual environment if available. * finally, the best and first candidate to test should be the Python executable used to launch the `tools/venv*.py` script. It was not relevant before because it was shell scripts, but do it is. The logic is shared in `_venv_common.py`, and will be called appropriately for both scripts. In priority decreasing order, python executable will be search and tested: * from the current Python executable, as exposed by `sys.executable` * from any python or pythonX (X as a python version like 2, 3 or 2.7 or 3.4) executable available in PATH * from the Windows Python launched `py` if available Individual changes were: * Update tools/venv3.py to support py launcher on Windows * Fix typo in help message * More explicit calls with space protection * Complete refactoring to take advantage of the python runtime, and control of the compatible version to use.