code: def __contains__(self, key):
      try:
          wr = _WeakArgs(key)
      except TypeError:
          return False
      return wr in self.data
  
imports: from collections import OrderedDict, Sequence
  from itertools import compress
  from weakref import WeakKeyDictionary, ref
  from six.moves._thread import allocate_lock
  from toolz.sandbox import unzip
  from trading_calendars.utils.memoize import lazyval
  from zipline.utils.compat import wraps
label_desc: Use image node_id 5 for calling the _WeakArgsDict obj's underlying member method code with example usage: obj.__contains__(key) and returns: unknown, False