single-instance
A lightweight, zero-dependency, cross-platform process single-instance lock for Python using OS-level advisory file locks. (基于系统文件锁的 Python 轻量级跨平台进程单例锁，零依赖，防强杀/崩溃死锁。)
🌠 Allow a single instance of a Python application to run at once | platform agnostic
