Add key argument to tuple.index()

[grigoriev-semyon]

Feature or enhancement

Proposal:

It would be useful to search a tuple in a functional-style manner

# tuple with structured data
data = ((1, 2), (2, 3))

# find index of 2 in classic manner:
for idx, item in enumerate(data):
    if item[1] == 2:
        break

# functional-style search:
idx = data.index(2, key=lambda i: i[1])

This manner is same to list.sort for example

data = [(1, 2), (2, 3)]
data.sort(key=lambda g: g[1])

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

Same functionality was discussed in #113773 but for list.index()

Linked PRs

• gh-113779 added key kw param to tuple.index() #113780

[ericvsmith]

Please open a discussion at https://discuss.python.org/c/ideas/6.

[grigoriev-semyon]

Please open a discussion at https://discuss.python.org/c/ideas/6.

https://discuss.python.org/t/add-key-argument-to-tuple-index/42625

[hauntsaninja]

There's more discussion over at #113773. I'm going to close this as a duplicate (most of the discussion points are the same / if it's added to list it should be added to tuple / overall I think we're unlikely to add this)