code: def _init_create_child(self):
          
          if self._requires_pty():
              self.create_child = mitogen.parent.hybrid_tty_create_child
          else:
              self.create_child = mitogen.parent.create_child
              self.create_child_args = {
                  'stderr_pipe': True,
              }
docs: Initialize the base class :attr:`create_child` and
          :attr:`create_child_args` according to whether we need a PTY or not.