code: def find_data_files(self, package, src_dir):
          
          patterns = self._get_platform_patterns(
              self.package_data,
              package,
              src_dir,
          )
          globs_expanded = map(glob, patterns)
          # flatten the expanded globs into an iterable of matches
          globs_matches = itertools.chain.from_iterable(globs_expanded)
          glob_files = filter(os.path.isfile, globs_matches)
          files = itertools.chain(
              self.manifest_files.get(package, []),
              glob_files,
          )
          return self.exclude_data_files(package, src_dir, files)
docs: Return filenames for package's data files in 'src_dir