import os
import pyblish.api as pyblish
​
class MyCollector(pyblish.ContextPlugin):
    """This plug-in identifies content and creates instances"""
​
    order = pyblish.CollectorOrder
​
    def process(self, context):
        for folder in os.listdir("."):
            if not folder.endswith("_asset"):
                continue
            instance = context.create_instance(folder)
            instance.data["family"] = "asset"