chumicro-kvstore

A persistent dict for counters, timestamps, and tokens that need to survive a reboot.

A dict-shaped store with commit() semantics. Auto-detects the right backend per runtime (NVM on CircuitPython, NVS on ESP32 MicroPython, LittleFS elsewhere, in-memory for tests), bounds writes with commit_if_changed() so unchanged state doesn't wear the flash, and surfaces capacity and corruption honestly.

Part of the ChuMicro family: small, focused Python libraries for microcontrollers and laptops. Browse all libraries.

Install

# CircuitPython (after `circup bundle-add ChuMicro/ChuMicro-Bundle-Experimental`)
circup install chumicro_kvstore

# MicroPython
mpremote mip install github:ChuMicro/ChuMicro-Bundle-Experimental/chumicro_kvstore

# CPython
pip install chumicro-kvstore-experimental

For bundle setup, pre-compiled .mpy bundles, the experimental channel, and details on PyPI naming, see the chumicro INSTALL guide.

Quick example

Boot counter that survives reboot:

from chumicro_kvstore import KVStore

store = KVStore(backend="auto")
store["boot_count"] = store.get("boot_count", 0) + 1
store.commit_if_changed()              # no flash write if value unchanged
print(store["boot_count"])             # → 1, 2, 3, … across power cycles

What's included

Where this fits

Leaf, with no upstream ChuMicro deps. Used directly in app code; no other ChuMicro library depends on it.

Platform support

Works on CPython, MicroPython, and CircuitPython.

Examples

Contributing

Issues, bug reports, and pull requests are welcome, and so is "I ran it on this board and here's what happened", some of the most useful feedback a hardware project can get. Development happens in the ChuMicro repository, whose contributing guide covers setup and the test workflow.

Docs

📖 Stable docs · Experimental docs

Find this library

• PyPI: chumicro-kvstore
• Bundle: ChuMicro-Bundle (CircuitPython & MicroPython)
• Experimental bundle: ChuMicro-Bundle-Experimental
• Source: libraries/kvstore

License

MIT