(I'm cross-posting this to the PyTables users list so that everyone can express their opinion. Please use it when possible.)
Thomas Breuel (el 2007-07-29 a les 05:47:02 +0200) va dir::
> thanks for making pytables available. We're creating a lot of different
> data files with a lot of different formats and our I/O code looks very
> cluttered.
>
> I was wondering whether it might be possible to enable the creation of
> groups and arrays in pytable through "natural naming"; that is, something
> like:
>
> hdf5.root.foo.create("Foo Group") # same as calling createGroup
> hdf5.root.foo.mydata = zeros((200,500)) # same as calling createArray
> hdf5.root.foo.something = hdf5old.root.foo.something # copy something over
> from another table
>
> etc.
Hi Thomas. I'd like to point out that natural naming is mainly intended
for node tree *navigation*, specially in interactive mode. We avoided
on purpose natural naming operations that altered the tree because:
1. It could lead to the accidental removal of nodes.
2. They would mean a *third* way of doing the same things:
a) file.copyNode(foo, bar)
b) foo._f_copy(bar)
c) bar.foo = foo
3. Semantics are less intuitive, i.e. does ``bar.foo = foo`` overwrite
an existing ``bar.foo``?
Having said that, the ``group.create(something)`` looks to me like a
different proposal: add ``_f_create*()`` methods to the groups which are
equivalent to the ``File.create*()`` ones. I think this doesn't fit in
the philosophy on node methods either (it would if ``g._f_copy('foo', g2)``
copied a child node, which it doesn't), but I may be wrong. Any more
opinions on this? ::
> That would clean up a lot of our I/O code. If you're concerned whether this
> is safe against typos, it could be an option on opening the file (although I
> don't really see any big problem there).
For programatic use, and specially if you're concerned about the looks
of your code, I'd recommend that you used the methods in the ``File``
class, which can work with full paths and have a more uniform syntax
since the special prefixes used in group methods are not needed.
Hope that helps,
::
Ivan Vilata i Balaguer >qo< http://www.carabos.com/
Cárabos Coop. V. V V Enjoy Data
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