Validating I

import pyblish.api
​
items = ["JOHN.person", "door.prop"]
​
class CollectInstances(pyblish.api.ContextPlugin):
  order = 0
​
  def process(self, context):
    for item in items:
      name, suffix = item.split(".")
      context.create_instance(name, family=suffix)
​
class ValidateNamingConvention(pyblish.api.InstancePlugin):
  order = 1
​
  def process(self, instance):
    name = instance.data["name"]
    assert name == name.title(), "Sorry, %s should have been %s" % (
      name, name.title())
​
pyblish.api.register_plugin(CollectInstances)
pyblish.api.register_plugin(ValidateNamingConvention)
​
import pyblish.util
pyblish.util.publish()
# Sorry, JOHN should have been John
# Sorry, door should have been Door
Stopped due to: failed validation

...
items = ["John.person", "Door.prop"]
...
pyblish.util.publish()
# John is valid
# Door is valid