I would like to create my own atom class but appear to be doing
something wrong. I basically just need a StringAtom but want to define a
new class with a new PyTables 'kind' of 'link' instead of 'string.'
I have added the following code to the atom.py file...
class LinkAtom(Atom):
"""
Defines an atom of type ``link``.
The item size is the *maximum* length in characters of strings.
"""
kind = 'link'
itemsize = property(
lambda self: self.dtype.base.itemsize,
None, None, "Size in bytes of a sigle item in the atom." )
type = 'string'
_defvalue = ''
def __init__(self, itemsize, shape=(), dflt=_defvalue):
if not hasattr(itemsize, '__int__') or int(itemsize) < 0:
raise ValueError( "invalid item size for kind ``%s``: %r; "
"it must be a positive integer"
% ('string', itemsize) )
Atom.__init__(self, 'S%d' % itemsize, shape, dflt)
However, when I run ipython and import tables a LinkAtom and by
extension a LinkCol is not created. Can someone tell me what I'm doing
wrong? This method of generating class in PyTables doesn't seen to be
very intuitive and/or pythonic.
-Mike
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