code: def __init__(self, *args, **kwargs):
      assert use_cython
  
      from Cython.Build import cythonize
  
      for e in extensions:
          for src in e.sources:
              cythonize(src)
  
      super(sdist.sdist, self).__init__(*args, **kwargs)
  
file_path: chainercv/setup.py
imports: from distutils.core import setup
  import os
  import pkg_resources
  from setuptools.command import sdist
  from setuptools import find_packages
  from distutils.extension import Extension
label_desc: Use image node_id 1 to create a new Sdist object from inherited base classes: sdist with example: obj = Sdist()