code: def get_command_class(self, command):
          
          if command in self.cmdclass:
              return self.cmdclass[command]
  
          eps = pkg_resources.iter_entry_points('distutils.commands', command)
          for ep in eps:
              ep.require(installer=self.fetch_build_egg)
              self.cmdclass[command] = cmdclass = ep.load()
              return cmdclass
          else:
              return _Distribution.get_command_class(self, command)
docs: Pluggable version of get_command_class()