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Hi,
I thought it would be nice if more object types than series and matrix
could be re-used in a python foreign block. So I'm attaching a first
attempt at a python function (gretl_bdlimport) which takes an XML text
file representing a gretl bundle (as written by gretl's bwrite), and
copies (some of) its contents to a python dictionary, with the same keys
as in the original bundle.
So far only the following data types are handled and copied, but this
could be extended:
- scalar (taken as generic float, post-process if you want an explicit
integer)
- string
- strings (array, put into a python list of strings)
This will only work under Python3, and requires xml.etree.ElementTree,
where I'm not sure what the min version for that is.
My proposal is to put this into gretl's gretl_io.py eventually.
Comments and testing welcome,
Sven
Attachments:
- attachment.html (text/html — 1.2 KB)
- bimport.py (text/plain — 1.3 KB)
On Tue, 28 Aug 2018, Sven Schreiber wrote:
I thought it would be nice if more object types than series and
matrix could
be re-used in a python foreign block. So I'm attaching a first attempt at a
python function (gretl_bdlimport) which takes an XML text file representing a
gretl bundle (as written by gretl's bwrite), and copies (some of) its
contents to a python dictionary, with the same keys as in the original
bundle.
Cool! Please keep us updated on this.
Allin
Am 29.08.2018 um 03:11 schrieb Allin Cottrell:
On Tue, 28 Aug 2018, Sven Schreiber wrote:
> I thought it would be nice if more object types than series and
> matrix could be re-used in a python foreign block. So I'm attaching a
> first attempt at a python function (gretl_bdlimport) which takes an
> XML text file representing a gretl bundle (as written by gretl's
> bwrite), and copies (some of) its contents to a python dictionary,
> with the same keys as in the original bundle.
Cool! Please keep us updated on this.
Here's the next round. It now covers the following types as convertible
bundle members: scalar, string, matrix, strings, matrices. (Lists and
series are already mostly covered by gretl, and nested bundles or arrays
of bundles are too complicated.) And it now does roundtripping:
- gretl_loadbundle is for conversion of a gretl bundle (in an XML file
as written by bwrite) to a python dictionary
- gretl_exportbundle is to take a python dict and write out an XML file
that can (hopefully) be read by gretl's bread
Arrays (of matrices, strings) are mapped to Python lists (of numpy
ndarrays in the matrix variant, strings).
There's minimal testing code included, so if you just run the file in
python you get a xml file with a gretl bundle as a result. Required
Python modules are: numpy, gzip, io, xml.etree.ElementTree, don't know
how restrictive or demanding that is. Python3 only, as mentioned before.
cheers,
sven
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Sven Schreiber