How to implement class/object metadata in Python? -

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i working on structured data analysis framework based on streaming data between nodes. nodes implemented subclasses of root node class provided framework. each node class/factory need metadata, such list of node's attributes, description, node output. metadata might both: end-users in front-end application or programming use - other stream management tools. in future there more of them.

(note started learn python while writing code)

currently metadata provided in class variable

class aggregatenode(base.node):     """aggregate"""      __node_info__ = {         "label" : "aggregate node",         "description" : "aggregate values grouping key fields.",         "output" : "key fields followed aggregations each aggregated field. last field "                    "record count.",         "attributes" : [             {                  "name": "keys",                  "description": "list of fields according records grouped"             },             {                 "name": "record_count_field",                  "description": "name of field record count stored. "                                 "default `record_count`"             }         ]     }

more examples can found here.

i feel can done in cleaner way. there 1 restriction: nodes custom subclasses classes, there should minimal interference potential future attribute names.

what thinking split current node_info. meant private framework, realize has wider use. thinking using node_ attributes: have common attribute namespace, not taking of names potential custom node attributes.

my question is: common way of providing such metadata in python programs? single variable dictionary? multiple variables, 1 each metadata attribute? (this conflict restriction) custom class/structure? use kind of prefix, node_* , use multiple variables?

i'm not sure if there "standard" way store custom metadata in python objects, example, python implementation of dbus adds attributes "_dbus" prefix published methods , signals.


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