Is it possible to reverse lookup / invert a dictionary IF the value is a tuple and you only have a single value from the tuple?

Question

Say I have a dictionary:

d = {
    0: ('f', 'farm'),
    1: ('m', 'mountain'),
    2: ('h', 'house'),
    3: ('t', 'forest'),
    4: ('d', 'desert')
}

and the only information I'm given is the value h. How can I retrieve 2 - the key that corresponds to h - from the dictionary?

In other words, I don't have the whole tuple ('h', 'house') to do a proper reverse lookup, I only have the h. Is there an elegant way to do this?

Does this answer your question? [Reverse lookup dict of tuples, or use a different data structure?](https://stackoverflow.com/questions/69188105/reverse-lookup-dict-of-tuples-or-use-a-different-data-structure) — no comment, Sep 15 '21 at 06:55
If it's an infrequent operation where you don't need to build a permanent reverse lookup table, `next((idx for (idx, entry) in d if entry[0] == 'h'), None)` should be okay. — Amadan, Sep 15 '21 at 06:56

score 0 · Answer 1 · answered Sep 15 '21 at 06:59

0

for k, v in d.items():
    if v[0] == 'h':
        print(k)

answered Sep 15 '21 at 06:59

khanpunk

1 Answers1