On 2021-05-23 13:37, Marco Sulla wrote:
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
A slight problem here: a tuple (1, 1) can be a key of the dict.
Also, if the first lookup returns a list or a tuple, and an argument can
be an index of that list, would be make sense to add a similar method to
lists and tuples?
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