Python 2 and Python 3 ?

Python 2 and Python 3 ?

[zimoun]

Hello,

I am asking if this behaviour is expected or if I miss something.


The command:

 guix package -i python

installs the python3 version and there is no python in .guix-profile/bin/.

And in another profile `guix package -i python@2' installs the python2
and there is python in profile/bin/.


To me, it is counter-intuitive. What is the reason ?
And there is not any, since python 2 is dying, I suggest that python
points to python3 and not python2.


Thank you.

All the best,
simon

Re: Python 2 and Python 3 ?

[Leo Famulari]

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On Fri, Feb 23, 2018 at 06:27:30PM +0100, zimoun wrote:
> I am asking if this behaviour is expected or if I miss something.
> 
> The command:
> 
>  guix package -i python
> 
> installs the python3 version and there is no python in .guix-profile/bin/.
> 
> And in another profile `guix package -i python@2' installs the python2
> and there is python in profile/bin/.
> 
> 
> To me, it is counter-intuitive. What is the reason ?
> And there is not any, since python 2 is dying, I suggest that python
> points to python3 and not python2.

The recommendation by the CPython team, expressed in their build
scripts, is to install Python 3 as `python3`, and we try to follow
upstream as closely as we can. I'd guess their reason is long-term
compatibility with existing Python software that assumes `python` is
Python 2.

We offer Python 3 as `python` in the special package python-wrapper.

In general, Guix does default to Python 3. If you want to use Python 2
in a package or profile, you have to specify it. Otherwise, using the
package named 'python' will give you Python 3. If there are several
versions of a Guix package with the same name, Guix uses the latest
version by default.

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Re: Python 2 and Python 3 ?

[zimoun]

Hi,

Thank you for the explanations.

All the best,
simon


On 23 February 2018 at 18:36, Leo Famulari <leo@famulari.name> wrote:
> On Fri, Feb 23, 2018 at 06:27:30PM +0100, zimoun wrote:
>> I am asking if this behaviour is expected or if I miss something.
>>
>> The command:
>>
>>  guix package -i python
>>
>> installs the python3 version and there is no python in .guix-profile/bin/.
>>
>> And in another profile `guix package -i python@2' installs the python2
>> and there is python in profile/bin/.
>>
>>
>> To me, it is counter-intuitive. What is the reason ?
>> And there is not any, since python 2 is dying, I suggest that python
>> points to python3 and not python2.
>
> The recommendation by the CPython team, expressed in their build
> scripts, is to install Python 3 as `python3`, and we try to follow
> upstream as closely as we can. I'd guess their reason is long-term
> compatibility with existing Python software that assumes `python` is
> Python 2.
>
> We offer Python 3 as `python` in the special package python-wrapper.
>
> In general, Guix does default to Python 3. If you want to use Python 2
> in a package or profile, you have to specify it. Otherwise, using the
> package named 'python' will give you Python 3. If there are several
> versions of a Guix package with the same name, Guix uses the latest
> version by default.