[Python-ideas] dict.get_deep()

I propose to add a get_deep(*args, default=_sentinel) method to dict. It can accept a single argument, that must be an iterable, or multiple arguments. The first element must be a key of the dict. If there's not a second element, the value is returned. If it's present, it tries to use it as an argument for the eventual __getitem__() of the value object, and so on. In this process, if a KeyError, an IndexError or a TypeError is raised, if default is set its value is returned, otherwise the exception will be raised. Example: d = {1: [42]} d.get_deep(1, 0) # 42 d.get_deep(range(3), default=1981) # 1981 d.get_deep((1, 1)) # IndexError: list index out of range