code: def install_namespaces(self):
      nsp = self._get_all_ns_packages()
      if not nsp:
          return
      filename = self._get_nspkg_file()
      self.outputs.append(filename)
      log.info("Installing %s", filename)
      lines = map(self._gen_nspkg_line, nsp)
  
      if self.dry_run:
          # always generate the lines, even in dry run
          list(lines)
          return
  
      with open(filename, "wt") as f:
          f.writelines(lines)
  
file_path: catboost/contrib/python/setuptools/py3/setuptools/namespaces.py
imports: import os
  from distutils import log
  import itertools
label_desc: Use image node_id 1 for calling the Installer obj's underlying member method code with example usage: obj.install_namespaces() without return types