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Re: Python reader for IDL save files. [message #44267 is a reply to message #44263]

Thu, 02 June 2005 00:30

Chris Lee
Messages: 101
Registered: August 2003

Senior Member

In article <1117675749.189108.60990@z14g2000cwz.googlegroups.com>,
"Unknown" <lefsky@gmail.com> wrote:

> I have two questions:
> 1. Has anyone worked on the problem of reading IDL save files from
> within python? This seems like a reasonable project for the usual IDL
> variable types.
> 2. The only problem I have thought of is how to represent arrays of IDL
> structures in Python. The one attempt I made at this was succesful, but
> the resulting data structures (lists of lists, I think) were very slow
> to work with. Has anyone worked on this problem? M
>

I may be wrong, but I thought IDL didn't use arrays of structures, it
used a single structure of arrays, which is why structure have to conform
to be put into the same array

IDL> help, [{b:2,c:3}, {a:2,c:3}]
<Expression> STRUCT = -> <Anonymous> Array[2]
IDL> help, [{b:2,c:3}, {a:2,c:3d}]
% Conflicting data structures:
IDL> help, [{b:2,c:3}, {a:2,c:3,d:3}]
% Conflicting data structures:

If you want to store these in a python 'structure', then I'd guess a
dictionary is what you want, e.g. s={'a':[1,2,3], 'b':['bob','joe','fred']}, but you
would probably need to use a class and redefine the __getattr__ method
or similar if you want the access method to be s[0].b

Chris.

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[Message index]

		Re: Python reader for IDL save files. By: Michael Wallace on Thu, 02 June 2005 13:34
		Re: Python reader for IDL save files. By: Matt Feinstein on Thu, 02 June 2005 06:53
		Re: Python reader for IDL save files. By: Thomas Pfaff on Thu, 02 June 2005 05:37
		Re: Python reader for IDL save files. By: Chris Lee on Thu, 02 June 2005 00:30
		Re: Python reader for IDL save files. By: Craig Markwardt on Wed, 01 June 2005 22:11

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