On Sat, Mar 3, 2018, 5:52 AM Marcus Ottosson <konstrukt...@gmail.com> wrote:
> No, there isn’t a datatype for dictionaries.
> Converting to string via json.dumps() is one way, you can also convert to
> a more compact string via something like cPickle.dumps(my_dict), or
> compress it to e.g. zip and then dumps it, but as far as Maya is
> concerned they are all of type string. Odds are you can convert it into any
> of the other available types, like a huge number, but string isn’t a bad
> option; it’s got no size limit (other than your total amount of RAM and
> disk space) and probably isn’t posing any relevant performance overhead on
> its own in terms of reading and writing to the attribute. The conversion
> between Maya and Python can however be costly, and pickle is likely the
> faster option in this case (depending on your data). The only thing to look
> out for with that is that it will limit the result to machine-readable
> output (e.g. Xz\939150\0klk5) and furthermore only be readable by the
> particular version of Python you are running at the time of performing the
> dump. That is, if you store a dumped pickle in Maya 2013 on Linux, odds are
> you can’t read it in 2018 on Windows (or even the same version of Maya but
> on different OSes) etc.
Why would that be true? If you specify the protocol when you read and write
the cPickle data, then it should be able to be dumped on Maya 2013 in Linux
and read in Maya 2018 on Windows.
One could stick with binary protocol 2 the whole way through, I would
think. Am I wrong?
On the other hand, you can pickle more than just dictionaries. Whole
> classes and instanced PyMel nodes and what else have you.
> You can see what Maya types are available as extra (i.e. “dynamic”)
> attributes here
> for example.
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