上下文管理器

介绍

RAII 概念与在 Python 中的应用 | 那时难决 (duyixian.cn)

示例

class MyContextManager:
    def __init__(self):
        self.used = False
    def __enter__(self):
        print('entering')
        self.used = True
        return self
    def __exit__(self, exc_type, exc_val, exc_tb):
        print('exiting')

with MyContextManager() as cm:
    print('in context')
    assert cm.used

---

Backlinks

• Python