Populate the attributes.

        Args:
          self (CleanCommand): the ``CleanCommand`` instance

        Returns:
          ``None``

def finalize_options(self):
        """Populate the attributes.

        Args:
          self (CleanCommand): the ``CleanCommand`` instance

        Returns:
          ``None``
        """
        self.cwd = os.path.abspath(os.path.dirname(__file__))
        self.build_dirs = [
            os.path.join(self.cwd, 'build'),
            os.path.join(self.cwd, 'htmlcov'),
            os.path.join(self.cwd, 'dist'),
            os.path.join(self.cwd, 'pylink_square.egg-info')
        ]
        self.build_artifacts = ['.pyc', '.o', '.elf', '.bin']