code: def __next__(self):
      if self.empty:
          raise StopIteration(
              "Queue is empty, no more objects to retrieve."
          )
      obj = self._queue[0]
      self._queue = self._queue[1:]
      return obj
  
imports: import warnings
  from bayes_opt.constraint import ConstraintModel
  from .target_space import TargetSpace
  from .event import Events, DEFAULT_EVENTS
  from .logger import _get_default_logger
  from .util import UtilityFunction, acq_max, ensure_rng
  from sklearn.gaussian_process.kernels import Matern
  from sklearn.gaussian_process import GaussianProcessRegressor
label_desc: Use image node_id 4 for calling the Queue obj's underlying member method code with example usage: obj.__next__() and returns: obj