def _contains_fallback(iterable, item):
    """Fallback to determine whether the iterable contains the value specified.

  Uses a loop instead of built-in methods.

  :param iterable:
      Iterable sequence.
  :param item:
      The value to find.
  :returns:
      ``True`` if the iterable sequence contains the value; ``False``
      otherwise.
  """
    for element in iter(iterable):
        if element == item:
            return True
    return False
