py27 ./. py3 version of ports

[Mathieu Arnold]

On Fri, Jan 11, 2019 at 02:40:02PM +0100, Matthias Apitz wrote:
> El día viernes, enero 11, 2019 a las 11:53:09a. m. +0100, Mathieu Arnold escribió:
> 
> > > > The background for my question is: I'm porting an AI system
> > > > https://community.mycroft.ai/t/mycroft-on-freebsd/5119/8
> > > > to CURRENT which is written for Linux and make excessive use of Python3.
> > > > 
> > > > What I have to set in poudriere to get some required py3 packages built as
> > > > well, but WITHOUT changing the dependency for my ~2000 packages which pulled
> > > > somehow in the standard py27 ports?
> > > 
> > > Sure.  You can build the py36 ports you want in addition to the regular py27
> > > ones.  Just add the port name(s) to your build list appended with '@py36'.
> > > It's generally safe to have both python27 and python36 packages of the same
> > > module installed simultaneously -- just remember to use 'python3' on the
> > > command line or in shebangs.
> > 
> > python3.6.  python3 is only there if you install the lang/python3 port.
> > (Which you probably should not.)
> 
> The above software in question needs python3 which I do have installed.
> Why I should not?

If it is only on your local machine, it is absolutely not a problem.

On the other hand, if you are porting an application, python3 is not a
valid shebang, and you must use USES=shebangfix to fix the offending
files.

-- 
Mathieu Arnold
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