pyinmem 1

Python in-memory database

PyInMemStore

PyInMemStore is a lightweight, in-memory data store written in Python. It provides a simple way to store and manipulate data structures such as strings, lists, sets, and sorted sets. The store offers thread-safe operations and supports key expiry, similar to Redis.

Features

• Basic data types: Strings, Lists, Sets, and Sorted Sets.
• Thread-safe operations.
• Key expiry functionality.
• Dynamic method dispatching based on data type.
• Easy extensibility for additional data types and operations.

Data Types and Operations

String

• set(key, value, ttl=None): Set a string value under a key. Optionally, specify a Time-To-Live (TTL) in seconds.
• get(key): Retrieve the string value for a given key.

List

• lpush(key, value): Push a value to the beginning of a list at a given key.
• rpop(key): Pop a value from the end of a list at a given key.
• llen(key): Get the length of the list at a given key.

Set

• sadd(key, *values): Add one or more values to a set at a given key.
• srem(key, *values): Remove one or more values from a set at a given key.
• smembers(key): Get all the members of the set at a given key.
• sis_member(key, value): Check if a value is a member of the set at a given key.

Sorted Set

• zadd(key, scores): Add one or more member-score pairs to a sorted set at a given key.
• zrange(key, start, stop): Get a range of members from a sorted set at a given key, sorted by score.
• zscore(key, member): Get the score of a member in a sorted set at a given key.

Usage

from pyinmemstore import PyInMemStore

store = PyInMemStore(save_data=True)


store.set('hello', 'world')
print(store.get('hello'))


store.lpush('mylist', 'hello')
store.lpush('mylist', 'world')
print(store.rpop('mylist'))


store.sadd('myset', 'hello', 'world')
print(store.smembers('myset'))


store.zadd('my_sorted_set', {'Alice': 100, 'Bob': 90})
print(store.zrange('my_sorted_set', 0, -1))
print(store.zscore('my_sorted_set', 'Alice'))