# Created on savesnippets.com · https://savesnippets.com/yWkxdvKh8Z84FT
from typing import Protocol

class Closeable(Protocol):
    def close(self) -> None: ...

def safe_use(resource: Closeable) -> None:
    try:
        # ... do work
        pass
    finally:
        resource.close()

class File:
    def close(self): print("file closed")

class Connection:
    def close(self): print("conn closed")

safe_use(File())          # ✓ — has close()
safe_use(Connection())    # ✓ — has close()
# safe_use("hello")        # mypy error — str has no close()