old_contents: # 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 __future__ import absolute_import, division, print_function
  
  
  class AES(object):
      name = "AES"
      block_size = 128
      key_sizes = set([128, 192, 256])
  
      def __init__(self, key):
          super(AES, self).__init__()
          self.key = key
  
          # Verify that the key size matches the expected key size
          if self.key_size not in self.key_sizes:
              raise ValueError("Invalid key size (%s) for %s".format(
                  self.key_size, self.name
              ))
  
      @property
      def key_size(self):
          return len(self.key) * 8
  
new_contents: # 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 __future__ import absolute_import, division, print_function
  
  
  class AES(object):
      name = "AES"
      block_size = 128
      key_sizes = set([128, 192, 256])
  
      def __init__(self, key):
          super(AES, self).__init__()
          self.key = key
  
          # Verify that the key size matches the expected key size
          if self.key_size not in self.key_sizes:
              raise ValueError("Invalid key size ({0}) for {1}".format(
                  self.key_size, self.name
              ))
  
      @property
      def key_size(self):
          return len(self.key) * 8
  
subject: Fix issue mixing %s and format for ValueError in AES