Re: [python-control-discuss] Python controls lib - preferred python version?

[Tony V. <ton...@al...>]

I agree with running against multiple versions; I do the same thing  
with some of the tools I build at JPL.  So that's pretty much what I  
thought you'd say.  Just thought I'd check.

-tv


On Jun 4, 2010, at 17:59, Richard Murray <mu...@cd...> wrote:

> It would be good if the package itself ran on as many versions of  
> pythons as we can easily support.  The CDS cluster is running python  
> 2.4 (about 2 years out of date).  I've got python 2.5.4 and 2.6.1  
> (via OS X) as well as python 2.6.5 (via fink) on my Mac.  By  
> default, I've been running 2.6.1 for all of my testing.
>
> There is some advantage to running different version of python since  
> that will help us keep compatibility across multiple flavors.  For  
> what we are doing, I don't think there should be anything version  
> specific that comes up.  As you've probably found, it's mainly just  
> a matter of getting a version of ipython up an running.  This is not  
> quite as easy as it should be, unfortunately...
>
> FWIW, I used fink for my ipython and scipy installs.  Even then, I  
> had to turn on the unstable distribution.
>
> -richard
>
> On 4 Jun 2010, at 17:35 , Tony Vanelli wrote:
>
>> Richard,
>>
>> After a fair bit of wrestling with the fact that various  
>> ramifications of OS X *also* having a older version of Python than  
>> what I had downloaded and installed, I've gotten the the Python  
>> Control Library v.0.3b to execute the 2nd order test-case.  (Not as  
>> far as I wanted to get, but it's a start...)
>>
>> But my experience of dealing with different Python versions  
>> (described below) on OS X has raised a question:
>>
>> Do you have a preferred version of Python you'd like us to use?
>>
>> OS X 10.6 comes bundled Python 2.6.1; I've installed Python 2.6.5  
>> (latest non-developmental release).  I recall Erik mentioned he'd  
>> installed Py2.7 in an earlier email.
>>
>> Erik: If you've installed Py2.7 and not tried running the 2nd-order  
>> example case yet, then you might be about to run into the same  
>> issues I smacked into.  It turns out that various "default"  
>> packages (and tools) that either come with Python 2.6.1, or that  
>> Apple pre-builds for you, are *not* included in the Python 2.6.4+  
>> distros available from python.org, and some these packages have to  
>> be installed by hand.
>>
>> iPython, it turns out, needs a little extra care.  My first  
>> installation apparently "locked on" to the Apple Python distro  
>> rather than the one I installed.  A simple first check is to run  
>> iPython (no arguments) and see which version of Python you *really*  
>> get... see excerpt below; note different boldfaced version numbers.
>>
>> I've got things cobbled together now, but I'm going to spend a  
>> little time ensuring it's clean.  If you hit a snag, I (fairly  
>> soon) should have some tips I can offer.
>>
>> -tv
>>
>> 43 acheron: /Users/tonyv> ipython
>> Python 2.6.1 (r261:67515, Feb 11 2010, 00:51:29)
>> Type "copyright", "credits" or "license" for more information.
>>
>> IPython 0.10 -- An enhanced Interactive Python.
>> ?         -> Introduction and overview of IPython's features.
>> %quickref -> Quick reference.
>> help      -> Python's own help system.
>> object?   -> Details about 'object'. ?object also works, ?? prints  
>> more.
>>
>> In [1]: quit()
>> Do you really want to exit ([y]/n)? y
>>
>> 44 acheron: /Users/tonyv> python
>> Python 2.6.5 (r265:79359, Mar 24 2010, 01:32:55)
>> [GCC 4.0.1 (Apple Inc. build 5493)] on darwin
>> Type "help", "copyright", "credits" or "license" for more  
>> information.
>>>>> quit()
>> 45 acheron: /Users/tonyv>
>>
>>
>>
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