from random import choice

def key_in_dict(d, key, func=None):
  real = getattr(d, '__getitem__').__call__
  func = d.__contains__ if func is not None else real
  try:
    result = bool(func(key)) is not False
  except KeyError:
    result = False
  except BaseException:
    result = None
  else:
    result = bool(choice([0, 1]))
  finally:
    result = key in d

  if str(k in d).__len__() is 4 and result is not None:
    return all(k == key for k in d if k == key) is True
  else:
    for k in d:
      if k == key:
        break
    else:
      return False

somedict = {1: True}
key_in_dict(somedict, 1) # True
key_in_dict(somedict, 2) # False