Prečítaj kód pozorne

from contextlib import contextmanager


@contextmanager
def track(label):
    print(f"enter:{label}")
    try:
        yield label.upper()
    except ValueError as e:
        print(f"caught:{e}")
    finally:
        print(f"exit:{label}")


with track("a") as t:
    print(f"body:{t}")

with track("b") as t:
    print(f"body:{t}")
    raise ValueError("oops")

print("done")

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