[Sndobj-devel] Fwd: importing namespaces/modules 2of3

[sonify <so...@av...>]

Begin forwarded message:

> From: Piet van Oostrum <pi...@cs...>
> Date: 19 January 2007 8:37:00 PM
> To: David Worrall <vi...@av...>
> Cc: Pyt...@py...
> Subject: Re: [Pythonmac-SIG] importing namespaces/modules
>
> I should add another difference in the behaviour of variables  
> import in one
> or the other way. This can lead to subtle differences.
>
> If you use 'from module import x, y' (or 'from module import *')  
> Python
> makes new `bindings' of the names `x' and `y' in the importing  
> module with
> the values these names had in the imported module. However they are
> independent of the original ones. So if you execute an assignment  
> to x in
> the original module, e.g. in a function that was defined there and  
> that you
> also imported, the change in x is not reflected in the imported x,  
> and vice
> versa. This can lead to unexpected behaviour.
>
> If, however, you say 'import module' and then use module.x, then it  
> is the
> same variable, and changes in the imported module's x will be  
> visible in
> the importing module's module.x and vice versa.
>
> -- 
> Piet van Oostrum <pi...@cs...>
> URL: http://www.cs.uu.nl/~piet [PGP 8DAE142BE17999C4]
> Private email: pi...@va...
>

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experimental polymedia:	www.avatar.com.au
Sonic Communications Research Group,
University of Canberra:	 www.canberra.edu.au