class_docstr: Custom command subclassed from Cython.Distutils.build_ext
  to compile pyx->c, and stop there. All this does is override the
  C-compile method build_extension() with a no-op.
code: def build_extension(self, ext) -> None:
      pass
  
imports: import argparse
  import multiprocessing
  import os
  from os.path import join
  import platform
  import shutil
  import sys
  from sysconfig import get_config_vars
  import numpy
  from pkg_resources import parse_version
  from setuptools import Command, Extension, setup
  from setuptools.command.build_ext import build_ext
  import versioneer
label_desc: Use image node_id 1 for calling the CythonCommand obj's underlying member method code with example usage: obj.build_extension(ext) without return types