add @oneshot decorator
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from typing import Callable
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from functools import wraps
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from ..error import OneShotError
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def oneshot(func: Callable) -> Callable:
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"""
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Raises a OneShotError if the decorated function is called more than once
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"""
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expired = False
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@wraps(func)
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def wrapper(*args, **kwargs):
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nonlocal expired
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if expired:
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raise OneShotError(func.__name__)
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expired = True
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return func(*args, **kwargs)
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return wrapper
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