Because the order of the above technique of (1) collecting, (2) validating and (3) extract-if-valid is so common, they are provided as keywords you can use in-place of a hard-coded number.
import pyblish.apidisk = {}items = ["JOHN.person", "door.prop"]class CollectInstances(pyblish.api.ContextPlugin):order = pyblish.api.CollectorOrder # <-- This is newdef process(self, context):for item in items:name, suffix = item.split(".")context.create_instance(name, family=suffix)class ValidateNamingConvention(pyblish.api.InstancePlugin):order = pyblish.api.ValidatorOrderdef process(self, instance):name = instance.data["name"]assert name == name.title(), "Sorry, %s should have been %s" % (name, name.title())class ExtractInstances(pyblish.api.InstancePlugin):order = pyblish.api.ExtractorOrderdef process(self, instance):disk[instance.data["name"]] = instancepyblish.api.register_plugin(CollectInstances)pyblish.api.register_plugin(ValidateNamingConvention)pyblish.api.register_plugin(ExtractInstances)import pyblish.utilpyblish.util.publish()# Sorry, JOHN should have been John# Sorry, door should have been Door
Notice that instead of picking a number at random, we instead utilised the built-in order of CVEI. This not only simplifies determining the role of each plug-in, it also allows Pyblish to make some basic assumptions about your plug-ins, such as when to stop.
These constants are nothing more than integer numbers.
CollectorOrder: 0ValidatorOrder: 1ExtractorOrder: 2
Together, they form the first three letters of "CVEI". We'll look at the last letter next.