[yocto] Problem with Python when running oe-init-build-env

[Raymond Yeung]

Thanks Zoran.


My Linux build machine uses Centos 7.  I thought I'd done the installation to Python 3.6.5.  If this is not Python3 > 3.4.0, then I'm confused.  The link I follow for installation is here:  https://janikarhunen.fi/how-to-install-python-3-6-1-on-centos-7.html


> python3.6 -V

Python 3.6.5

>python -V

Python 2.7.5


Anyway, I realize what went wrong.  I'd Krogoth (a 2016 Poky) running before.  Now as I'm migrating to Rocko (a 2017 Poky), I try to solve a Python versioning issue by installing Python only (as above).  However, there may be other packages I need to update.  After getting latest Reference Manual, download and install latest environment, I no longer have python3 issue.  However, the Python version of why Python3.6 won't satisfy Python > 3.4.0 still puzzles me (though no longer blocking me).


Raymond


________________________________
From: Zoran Stojsavljevic <zoran.stojsavljevic at gmail.com>
Sent: Tuesday, May 1, 2018 11:19 PM
To: Raymond Yeung
Cc: yocto at yoctoproject.org
Subject: Re: [yocto] Problem with Python when running oe-init-build-env

Hello Raymond,

The problem is that you (talking about your host distro):
[1] Do NOT have python3 package installed;
[2] Do have python3 package < 3.4.0 version, so you need to upgrade!

So, I have no idea which host distro you are using, but:
[1] If Debian/Ubuntu, then: apt-get install python3
     If Fedora, then dnf install python3
[2] If Debian/Ubuntu, then: apt-get update python3
     If Fedora, then dnf update python3

Hope this helps,
Zoran
_______

On Tue, May 1, 2018 at 10:43 PM, Raymond Yeung <rksyeung at hotmail.com> wrote:
> I'd just git cloned Rocko and meta-ti.  When I try to source
> oe-init-build-env, I got errors:
>
>
> -bash: python3: command not found
>
> BitBake requires Python 3.4.0 or later as 'python3'.  "python -V" gives
> "Python 2.7.9".  "python3" is not in $PATH.  I'd followed some detailed
> online description to install Python 3.6 on CentOS 7.  However, after
> installation, it looks like I need to invoke it with python3.6.
>
>
> How does this work now?  I suppose the oe-init-build-env script uses/expects
> python3, not python3.6.
>
>
> Any insight?
>
>
> Raymond
>
>
> --
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