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To: python-list@python.org
From: Lie Ryan <lie.1296@gmail.com>
Subject: Re: a little help
Date: Fri, 06 Jan 2012 06:53:34 +1100
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On 01/06/2012 03:04 AM, Andres Soto wrote:
>     Please, see my comments between your lines. Thank you very much for
>     your explanation!
>     *
>     *
>     *From:* Lie Ryan <lie.1296@gmail.com>
>     *To:* python-list@python.org
>     *Sent:* Thursday, January 5, 2012 2:30 AM
>     *Subject:* Re: a little help
>
>     On 01/05/2012 11:29 AM, Andres Soto wrote:
>      > my mistake is because I have no problem to do that using Prolog which
>      > use an interpreter as Python. I thought that the variables in the
>     main
>      > global memory space (associated with the command line
>     environment) were
>      > kept, although the code that use it could change.
>      > As you explain me, Python behave like a compiled language: any time I
>      > make a change in the code, I have to "compile" it again, and
>     re-run (and
>      > re-load the data). There is nothing to do.
>
>     it is usually trivial to redefine state-free functions, you just
>     need to copy and paste the new code into the shell.
>
>     &&&yes, I am already using that, but I thought that maybe there were
>     a more elegant way. In Prolog, you just have to reload the code and
>     nothing happens with the global variables

Alternative to copy pasting is to reload the module; but that comes with 
the caution that the old function/class definition may still be lying 
around in the global namespace if you imported them into your global 
namespace, so you had to either restrict yourself to using 
class/function using the module namespace or you had to remember to 
reimport them into your global namespace. You also need to be careful if 
you passes a module function as callbacks, as the callback will not be 
automatically replaced with the new definition.