[namtao]

It does! I wanted exactly the same and couldn't find something simple enough, so I made it (last month):

Stord.io is a key/value store. This is often modelled as a hashmap or a dictionary in programming languages.

Under the hood, stord.io is powered by Redis, with a thin python application wrapper, based on Flask. Stord.io doesn’t assume anything about your data, make whatever nested schema you want!

http://stord.io

Full disclosure: if this wasn't already clear, it's my project. I would LOVE feedback/feature suggestions.