code: def build_package_data(self):
          
          for package, src_dir, build_dir, filenames in self.data_files:
              for filename in filenames:
                  target = os.path.join(build_dir, filename)
                  self.mkpath(os.path.dirname(target))
                  srcfile = os.path.join(src_dir, filename)
                  outf, copied = self.copy_file(srcfile, target)
                  srcfile = os.path.abspath(srcfile)
                  if (copied and
                          srcfile in self.distribution.convert_2to3_doctests):
                      self.__doctests_2to3.append(outf)
docs: Copy data files into build directory