On Fri, 29 May 2020 at 21:42, Elliott, Robert (Servers) <elliott@xxxxxxx> wrote:
>
> > -----Original Message-----
> > From: Sitsofe Wheeler <sitsofe@xxxxxxxxx>
> > Sent: Thursday, May 28, 2020 3:20 AM
> > To: Elliott, Robert (Servers) <elliott@xxxxxxx>
> > Cc: Vincent Fu <vincentfu@xxxxxxxxx>; Rebecca Cran
> > <rebecca@xxxxxxxxx>; fio@xxxxxxxxxxxxxxx; Jens Axboe
> > <axboe@xxxxxxxxx>
> > Subject: Re: Python scripts - /usr/bin/env python3 vs python vs
> > python2.7
> >
> > > I have been using python a lot recently and also noticed that the
> > > /usr/bin/env format is the preferred approach; it works best across
> > > linux distros, local installs, and is even recognized by Python in
> > > Windows.
> >
> > I'm guessing that's only in git for windows style shells? Surely
> > native Windows will just look at the extension and then look in the
> > registry?
>
> With Python 3.8 installed (as "python", which is how the upstream installer
> names it), this is what it does in PowerShell:
>
> PS D:\> type testshe.py #!/usr/bin/env python
> print("hello")
>
> PS D:\> type testshe2.py #!/usr/bin/env python2
> print("hello")
>
> PS D:\> type testshe3.py #!/usr/bin/env python3
> print("hello")
>
> PS D:\> type testshe310.py #!/usr/bin/env python3.10
> print("hello")
>
> PS D:\> ./testshe.py; ./testshe2.py; ./testshe3.py; ./testshe310.py
> hello
> Requested Python version (2) is not installed
> hello
> Requested Python version (3.10) is not installed
>
> PS D:\> python ./testshe.py; python ./testshe2.py; python ./testshe3.py; python ./testshe310.py
> hello
> hello
> hello
> hello
>
> In other words, it checks the shebang version if invoked indirectly,
> but ignores it the python script filename is an argument.
Wow - TIL... It looks like this support is down to the Python launcher
for Windows (https://docs.python.org/3/using/windows.html#shebang-lines
). Thanks for taking the time to correct me Elliot!
--
Sitsofe | http://sucs.org/~sits/
