[Python-ideas] Migration of /usr/bin/python to python3

[M.-A. Lemburg]

On 11.03.2015 21:03, David Mertz wrote:
> https://www.python.org/dev/peps/pep-0394/

I think the migration should start with modifying scripts to use

#!/usr/bin/env python2

when they are Python 2 only (*) and

#!/usr/bin/env python3

when they are Python 3 only and

#!/usr/bin/env python

only when they support both Python 2 and 3.

"Explicit is better than implicit" and all that Zen :-)

Once that's done, switching the symlink is really a no-brainer.

The recipe for this is easy too:

1. replace all "#!/usr/bin/env python" with "#!/usr/bin/env python2"
2. migrate your scripts one by one to either Python 3.x or
   to Python 2.7 + 3.4+
3. after migration replace "#!/usr/bin/env python2" with
   "#!/usr/bin/env python3" or "#!/usr/bin/env python" resp.

(*) Some OSes may require to use python2.7, if they don't come
with a symlink from python2 -> python2.7.

-- 
Marc-Andre Lemburg
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