old_contents: #    Copyright 2016 Mirantis, Inc.
  #
  #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  from flask import Blueprint, render_template
  from flask_login import login_required
  
  challenges = Blueprint('challenges', __name__)
  
  
  @challenges.route('/challenges', methods=['GET'])
  @login_required
  def challenges_view():
      return render_template('challenges.html', page="Challenges")
  
new_contents: #    Copyright 2016 Mirantis, Inc.
  #
  #    Licensed under the Apache License, Version 2.0 (the "License"); you may
  #    not use this file except in compliance with the License. You may obtain
  #    a copy of the License at
  #
  #         http://www.apache.org/licenses/LICENSE-2.0
  #
  #    Unless required by applicable law or agreed to in writing, software
  #    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  #    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
  #    License for the specific language governing permissions and limitations
  #    under the License.
  import requests
  
  from flask import Blueprint, render_template, jsonify
  from flask_login import login_required
  
  challenges = Blueprint('challenges', __name__)
  
  
  @challenges.route('/challenges', methods=['GET'])
  @login_required
  def challenges_view():
      return render_template('challenges.html', page="Challenges")
  
  
  @challenges.route('/exercises', methods=['GET'])
  @login_required
  def api_exercises():
      exercises = requests.get("http://localhost:8000/").json()
      result = {
          "exercises":
              []
      }
      for current in exercises['exercises']:
          result['exercises'].append({
              "name": current.get('name', 'unknown'),
              "category": current.get('answers')[0].split(".")[1],
              "solved": 0,
              "cost": 100
          })
      return jsonify(result)
  
subject: Implement demo 'exercises' api method.