code: def _compat_name(new_name, compat_name=None):
      
  
      if compat_name is not None:
          assert "slave" in compat_name.lower()
          assert new_name == "" or "worker" in new_name.lower(), new_name
          return compat_name
  
      compat_replacements = {
          "worker": "slave",
          "Worker": "Slave",
      }
  
      compat_name = new_name
      assert "slave" not in compat_name.lower()
      assert "worker" in compat_name.lower()
      for new_word, old_word in compat_replacements.items():
          compat_name = compat_name.replace(new_word, old_word)
  
      assert compat_name != new_name
      assert "slave" in compat_name.lower()
      assert "worker" not in compat_name.lower()
  
      return compat_name
docs: Returns old API ("slave") name for new name ("worker").
  
      >>> assert _compat_name("Worker") == "Slave"
      >>> assert _compat_name("SomeWorkerStuff") == "SomeSlaveStuff"
      >>> assert _compat_name("SomeWorker", compat_name="SomeBuildSlave") == \
          "SomeBuildSlave"
  
      If `compat_name` is not specified old name is construct by replacing in
      `new_name`:
          "worker" -> "slave",
          "Worker" -> "Slave".
  
      For the sake of simplicity of usage if `compat_name` argument is specified
      it will returned as the result.