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Python Flask REST API Resourceful Blueprints Register API

Bummer! name 'ingredients_api' is not defined error given after registering 2 blueprints into api.py. Help pls!

The challenge instruction includes 'import the blueprints into app.py and register them both', not helpful as the api.py is the file presented in the challenge. I am working the lesson in ATOM using python 2.7.14 (2017) and flask 0.12.2 where flask_restful takes the place of flask.ext.restful, and I am not getting the same error. I'm stuck. Any correction findings are appreciated.

api.py
from flask import Flask, Blueprint

app = Flask(__name__)
app.register_blueprint(ingredients_api)
app.register_blueprint(recipes_api)

if __name__ == '__main__':
    app.run()
resources/ingredients.py
from flask.ext.restful import Resource, Api
from flask import Blueprint
import models


class IngredientList(Resource):
    def get(self):
        return 'IngredientList'


class Ingredient(Resource):
    def get(self, id):
        return 'Ingredient'

ingredients_api = Blueprint('resources.ingredients', __name__)
api = Api(ingredients_api)
api.add_resource(
    IngredientList,
    '/api/v1/ingredients',
    endpoint='ingredients'
)
api.add_resource(
    Ingredient,
    '/api/v1/ingredients/<int:id>',
    endpoint='ingredient'
)
resources/recipes.py
from flask.ext.restful import Resource, Api
from flask import Blueprint
import models


class RecipeList(Resource):
    def get(self):
        return 'RecipeList'


class Recipe(Resource):
    def get(self, id):
        return 'Recipe'

recipes_api = Blueprint('resources.recipes', __name__)
api = Api(recipes_api)
api.add_resource(
    RecipeList,
    '/api/v1/recipes',
    endpoint='recipes'
)
api.add_resource(
    Recipe,
    '/api/v1/recipes/<int:id>',
    endpoint='recipe'
)