code: def write_shared_locations(self, paths, dry_run=False):
          
          shared_path = os.path.join(self.path, 'SHARED')
          logger.info('creating %s', shared_path)
          if dry_run:
              return None
          lines = []
          for key in ('prefix', 'lib', 'headers', 'scripts', 'data'):
              path = paths[key]
              if os.path.isdir(paths[key]):
                  lines.append('%s=%s' % (key,  path))
          for ns in paths.get('namespace', ()):
              lines.append('namespace=%s' % ns)
  
          with codecs.open(shared_path, 'w', encoding='utf-8') as f:
              f.write('\n'.join(lines))
          return shared_path
docs: Write shared location information to the SHARED file in .dist-info.
          :param paths: A dictionary as described in the documentation for
          :meth:`shared_locations`.
          :param dry_run: If True, the action is logged but no file is actually
                          written.
          :return: The path of the file written to.