Recipe package system.

recipe_modules/properties/example.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-from infra.libs.infra_types import thaw
 from recipe_engine.recipe_api import Property
 
-DEPS = ['properties', 'step']
+DEPS = [
+  'recipe_engine/properties',
+  'recipe_engine/step',
+]
 
 PROPERTIES = {
   'test_prop': Property(),
 }
 
 def RunSteps(api, test_prop):
   api.step('echo', ['echo'] + [repr(test_prop)])
   api.step('echo all', ['echo'] + [repr(api.properties.thaw())])
 
 def GenTests(api):
   yield api.test('basic') + api.properties(
     test_prop={'key': 'value'})
   yield api.test('lists') + api.properties(
     test_prop={'key': ['value', ['value']]})
   yield api.test('dicts') + api.properties(
     test_prop={'key': {'key': 'value', 'other_key': {'key': 'value'}}})
 
   yield (
       api.test('exception') +
       api.expect_exception('ValueError')
   )
-