code: def _validate_arch(self, arch = None):
          
  
          # Use the default architecture if none specified.
          if not arch:
              arch = win32.arch
  
          # Validate the architecture.
          if arch not in self.supported:
              msg = "The %s engine cannot decode %s code."
              msg = msg % (self.name, arch)
              raise NotImplementedError(msg)
  
          # Return the architecture.
          return arch
docs: @type  arch: str
          @param arch: Name of the processor architecture.
              If not provided the current processor architecture is assumed.
              For more details see L{win32.version._get_arch}.
  
          @rtype:  str
          @return: Name of the processor architecture.
              If not provided the current processor architecture is assumed.
              For more details see L{win32.version._get_arch}.
  
          @raise NotImplementedError: This disassembler doesn't support the
              requested processor architecture.