def license_file(self):
metadata = self.distribution.get_option_dict('<STR_LIT>')<EOL>if not '<STR_LIT>' in metadata:<EOL><INDENT>return None<EOL><DEDENT>return metadata['<STR_LIT>'][<NUM_LIT:1>]<EOL>
Return license filename from a license-file key in setup.cfg, or None.