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import sys
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def load_contextvar_class():
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if sys.version_info >= (3, 7):
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from contextvars import ContextVar
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elif sys.version_info >= (3, 5, 3):
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from aiocontextvars import ContextVar
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else:
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from contextvars import ContextVar
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return ContextVar
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ContextVar = load_contextvar_class()
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