code: def filename(self):
          
          if self._filename is None:
              if os.path.splitext(self.destination)[1]:
                  # If the filename has been given make use of it
                  target_file = self.destination
              else:
                  # Otherwise create it from the build details
                  target_file = os.path.join(self.destination,
                                             self.build_filename(self.binary))
  
              self._filename = os.path.abspath(target_file)
  
          return self._filename
docs: Return the local filename of the build.