code: def enq(self, group):
      depth = group.depth
      while depth > len(self.queue) - 1:
          self.queue.append([])
      self.queue[depth].append(group)
  
imports: from __future__ import absolute_import, division, print_function
  import datetime
  import platform
  import re
  import sys
  import types
  from collections import deque
  from contextlib import contextmanager
  from io import StringIO
  from hypothesis.internal.compat import PY3, cast_unicode, get_stream_enc, string_types
label_desc: Use image node_id 2 for calling the GroupQueue obj's underlying member method code with example usage: obj.enq(group) without return types