I am new to pytables and would like to subclass a column type like
StringCol and tableExtension.Row so that I can have control over what
tableExtension.Row.__getitem__() returns when it encounters my new
column type. I have tried to work my way through the code but find
myself trying to figure out how each of these column types are created
rather than finding a concrete class to inherit from. I also can't seem
to find a simple .py file in my distro (installed through python(x,y))
where tableExtension.Row is implemented (just a .pyd) so that I can see
how the original tableExtension.Row.__getitem__() method is
implemented. I would like to introduce some type checking for my custom
column type. I have searched the archives with no luck.
What I'm trying to accomplish is to implement a table with custom column
types that inherit from StringCol() that "point" to anyone of the
following CArray, EArray and VLArray via an internal path to the actual
array object in the file. Right now I have to store the path as a string
then search the table to retrieve the path which I then use to go and
get the data array. I would simply like to add some type checking in the
tableExtension.Row.__getitem__() method that checks for a CArrayCol,
EArrayCol and VLArrayCol type (all just subclasses of StringCol holding
my text path) and then returns the actual array instead of the path.
Anyone who could point me in the right direction on where I could either
get the information I need to start down this road or a quick a dirty
implementation to start from would be greatly appricieated.
Regards,
Mike
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