[Python] Efficient way to set up a persistent read-only dictionary with many keys but simple...

I have roughly 100k (fairly short) unicode strings and for each of them a corresponding integer.

I need to store them in a dicionary-like persistent object that will be then accessed only for reading.

I'm looking for a solution that doesn't fill the ram loading the whole structure and not too much greedy of space on disk.

I already tried dbm and shelve, but I got a resulting file of 30Mb+.

I'm sure there are tools which fits better on this specific case, so any pointers (for both python2 or python3) are welcome.

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