old_contents: #  Copyright 2015-2016 Masayuki Yamamoto
  #
  #  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.
  """Handle nicovideo.jp user_session."""
  
  class LoaderNotFoundError(Exception):
      """Session loader is not found."""
  
  
  class UserSessionNotFoundError(Exception):
      """Profile exists, but user_session is not found."""
  
new_contents: #  Copyright 2015-2016 Masayuki Yamamoto
  #
  #  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.
  """Handle nicovideo.jp user_session."""
  
  import pkg_resources
  
  
  class LoaderNotFoundError(Exception):
      """Session loader is not found."""
  
  
  class UserSessionNotFoundError(Exception):
      """Profile exists, but user_session is not found."""
  
  
  def load(ltype, profile):
      for entry in pkg_resources.iter_entry_points('yanico.sessions', ltype):
          load_func = entry.load()
          return load_func(profile)
      raise LoaderNotFoundError('{} loader is not found.'.format(ltype))
  
subject: Add load function