[gentoo-user] IPython with Python3 - what magic am I missing?

[gentoo-user] IPython with Python3 - what magic am I missing?

[Helmut Jarausch]

Hi,

I'd like start IPython with Python3 as underlying Python interpretor.
GenToo has some magic to invoke IPython which I don't understand.

/usr/bin/ipython is a symlink to /usr/bin/python-exec which is a script
invoking the binary /usr/bin/python-exec-c

I don't have Python3 as standard Python version (too dangerous with  
Portage?)

How can I convince IPython to use Python3?

I've tried
python3 /usr/lib64/python3.3/site-packages/spyderlib/widgets/ipython.py
but hits just quits without any visible action.

Many thanks for a hint,
Helmut

Re: [gentoo-user] IPython with Python3 - what magic am I missing?

[Mateusz Kowalczyk]

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On 20/06/13 08:31, Helmut Jarausch wrote:
> Hi,
> 
> I'd like start IPython with Python3 as underlying Python
> interpretor. GenToo has some magic to invoke IPython which I don't
> understand.
> 
> /usr/bin/ipython is a symlink to /usr/bin/python-exec which is a
> script invoking the binary /usr/bin/python-exec-c
> 
> I don't have Python3 as standard Python version (too dangerous with
>  Portage?)

Portage does just fine with Python3. In fact, it's actually faster (I
hear claims of upto 30% speed improvement but I haven't seen any data
nor tested it myself.).

> 
> How can I convince IPython to use Python3?
> 
> I've tried python3
> /usr/lib64/python3.3/site-packages/spyderlib/widgets/ipython.py but
> hits just quits without any visible action.
> 
> Many thanks for a hint, Helmut
> 


- -- 
Mateusz K.
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Re: [gentoo-user] IPython with Python3 - what magic am I missing?

[Dale]

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Mateusz Kowalczyk wrote:
> On 20/06/13 08:31, Helmut Jarausch wrote:
> > Hi,
>
> > I'd like start IPython with Python3 as underlying Python
> > interpretor. GenToo has some magic to invoke IPython which I don't
> > understand.
>
> > /usr/bin/ipython is a symlink to /usr/bin/python-exec which is a
> > script invoking the binary /usr/bin/python-exec-c
>
> > I don't have Python3 as standard Python version (too dangerous with
> >  Portage?)
>
> Portage does just fine with Python3. In fact, it's actually faster (I
> hear claims of upto 30% speed improvement but I haven't seen any data
> nor tested it myself.).
>

Is there a way to tell portage to use python3 by default then?  I have
it here so maybe it is already using python3?  Anyway to know?

Dale


:-)  :-)


-- 
I am only responsible for what I said ... Not for what you understood or
how you interpreted my words!


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Re: [gentoo-user] IPython with Python3 - what magic am I missing?

[Adam Carter]

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>
>  Is there a way to tell portage to use python3 by default then?  I have it
> here so maybe it is already using python3?  Anyway to know?
>

I just tried eselect python set 2, the grepped ps when running an emerge
--sync:
# eselect python list
Available Python interpreters:
  [1]   python2.7
  [2]   python3.2 *
# ps -ef | grep emerge
root      6242  6127  2 22:29 pts/0    00:00:00 /usr/bin/python3.2
/usr/bin/emerge --sync

So, just the usual.

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Re: [gentoo-user] IPython with Python3 - what magic am I missing?

[Neil Bothwick]

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On Thu, 20 Jun 2013 07:16:31 -0500, Dale wrote:

> Is there a way to tell portage to use python3 by default then? 

emerge it with the python3 USE flag.

> I have
> it here so maybe it is already using python3?  Anyway to know?

ps aux | grep emerge

while emerge is running.


-- 
Neil Bothwick

Give a man a fish and you feed him for a day;
Teach him to use the Net and he won't bother you for weeks.

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Re: [gentoo-user] IPython with Python3 - what magic am I missing?

[Dale]

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Neil Bothwick wrote:
> On Thu, 20 Jun 2013 07:16:31 -0500, Dale wrote:
>
>> Is there a way to tell portage to use python3 by default then?
>
> emerge it with the python3 USE flag.

I added that in package.use for future reference.  That took out the
python2 support.  I also added this to make.conf:

PYTHON_TARGETS="python3_2"


>
>
>> I have
>> it here so maybe it is already using python3?  Anyway to know?
>
> ps aux | grep emerge
>
> while emerge is running.
>
>

Now I get this:

root@fireball / # ps aux | grep emerge
root     23969 92.5  0.5 184900 94644 pts/1    RN+  12:25   0:01
/usr/bin/python3 /usr/bin/emerge -pv portage
root     23977  0.0  0.0   8596   880 pts/2    S+   12:25   0:00 grep
--colour=auto emerge
root@fireball / #

By the way, you better be fast to get that too.  It seems emerge is
faster with python3.  Now to sync and do some real testing.  ;-)

Thanks Neil and Adam.

Dale

:-)  :-)

-- 
I am only responsible for what I said ... Not for what you understood or
how you interpreted my words!


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Re: [gentoo-user] IPython with Python3 - what magic am I missing?

[Dustin C. Hatch]

On 6/20/2013 02:31, Helmut Jarausch wrote:
> Hi,
>
> I'd like start IPython with Python3 as underlying Python interpretor.
> GenToo has some magic to invoke IPython which I don't understand.
>
> /usr/bin/ipython is a symlink to /usr/bin/python-exec which is a script
> invoking the binary /usr/bin/python-exec-c
>
> I don't have Python3 as standard Python version (too dangerous with
> Portage?)
>
> How can I convince IPython to use Python3?
>
> I've tried
> python3 /usr/lib64/python3.3/site-packages/spyderlib/widgets/ipython.py
> but hits just quits without any visible action.
>
> Many thanks for a hint,
> Helmut
>
If you built dev-python/ipython with PYTHON_TARGETS="python3_2", then 
there will be a /usr/bin/ipython-python3.2 script that will launch 
IPython with the Python 3.2 interpreter, even if the default Python 
implementation is 2.7.

-- 
♫Dustin
http://dustin.hatch.name/

Re: [gentoo-user] IPython with Python3 - what magic am I missing?

[Helmut Jarausch]

On 06/20/2013 04:53:00 PM, Dustin C. Hatch wrote:
> If you built dev-python/ipython with PYTHON_TARGETS="python3_2", then  
> there will be a /usr/bin/ipython-python3.2 script that will launch  
> IPython with the Python 3.2 interpreter, even if the default Python  
> implementation is 2.7.

Yes, thanks,
that works!

Helmut