import lru_cache

with lru_cache.open("cache.pickle", max_bytesize=lru_cache.bytesize(kb=5)) as cache:
    cache["answer"] = 42

import click
import lru_cache

@click.group()
@click.option("--cache-path", default="cache.pickle", type=click.Path(writable=True))
@click.pass_context
def cli(ctx, cache_path):
    ctx.obj = ctx.with_resource(lru_cache.open(cache_path))

@cli.command()
@click.pass_obj
def incr(cache: lru_cache.LRUCache):
    cache["count"] = count = cache.get("count", 0) + 1
    click.echo(f"count: {count}")