old_contents: """Utils module."""
  
  from inspect import isclass
  
  from .errors import Error
  
  
  def is_provider(instance):
      """Check if instance is provider instance."""
      return (not isclass(instance) and
              hasattr(instance, '__IS_OBJECTS_PROVIDER__'))
  
  
  def ensure_is_provider(instance):
      """Check if instance is provider instance, otherwise raise and error."""
      if not is_provider(instance):
          raise Error('Expected provider instance, '
                      'got {0}'.format(str(instance)))
      return instance
  
  
  def is_injection(instance):
      """Check if instance is injection instance."""
      return (not isclass(instance) and
              hasattr(instance, '__IS_OBJECTS_INJECTION__'))
  
  
  def is_init_arg_injection(instance):
      """Check if instance is init arg injection instance."""
      return (not isclass(instance) and
              hasattr(instance, '__IS_OBJECTS_INIT_ARG_INJECTION__'))
  
  
  def is_attribute_injection(instance):
      """Check if instance is attribute injection instance."""
      return (not isclass(instance) and
              hasattr(instance, '__IS_OBJECTS_ATTRIBUTE_INJECTION__'))
  
  
  def is_method_injection(instance):
      """Check if instance is method injection instance."""
      return (not isclass(instance) and
              hasattr(instance, '__IS_OBJECTS_METHOD_INJECTION__'))
  
new_contents: """Utils module."""
  
  from six import class_types
  
  from .errors import Error
  
  
  def is_provider(instance):
      """Check if instance is provider instance."""
      return (not isinstance(instance, class_types) and
              hasattr(instance, '__IS_OBJECTS_PROVIDER__'))
  
  
  def ensure_is_provider(instance):
      """Check if instance is provider instance, otherwise raise and error."""
      if not is_provider(instance):
          raise Error('Expected provider instance, '
                      'got {0}'.format(str(instance)))
      return instance
  
  
  def is_injection(instance):
      """Check if instance is injection instance."""
      return (not isinstance(instance, class_types) and
              hasattr(instance, '__IS_OBJECTS_INJECTION__'))
  
  
  def is_init_arg_injection(instance):
      """Check if instance is init arg injection instance."""
      return (not isinstance(instance, class_types) and
              hasattr(instance, '__IS_OBJECTS_INIT_ARG_INJECTION__'))
  
  
  def is_attribute_injection(instance):
      """Check if instance is attribute injection instance."""
      return (not isinstance(instance, class_types) and
              hasattr(instance, '__IS_OBJECTS_ATTRIBUTE_INJECTION__'))
  
  
  def is_method_injection(instance):
      """Check if instance is method injection instance."""
      return (not isinstance(instance, class_types) and
              hasattr(instance, '__IS_OBJECTS_METHOD_INJECTION__'))
  
subject: Fix of bug in Python 2.6 with failed isclass check in inspect module