Прочети кода внимателно

from contextlib import ExitStack


events: list[str] = []


class Tracked:
    def __init__(self, name: str) -> None:
        self.name = name

    def __enter__(self) -> "Tracked":
        events.append(f"enter {self.name}")
        return self

    def __exit__(self, *exc: object) -> bool:
        events.append(f"exit {self.name}")
        return False


with ExitStack() as stack:
    a = stack.enter_context(Tracked("A"))
    b = stack.enter_context(Tracked("B"))
    c = stack.enter_context(Tracked("C"))
    events.append("body")

for e in events:
    print(e)

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