73 lines
1.7 KiB
Python
73 lines
1.7 KiB
Python
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"""
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compatibility functions for different Python versions
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"""
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# Copyright (C) 2021 The Psycopg Team
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import sys
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import asyncio
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from typing import Any, Awaitable, Generator, Optional, Sequence, Union, TypeVar
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# NOTE: TypeAlias cannot be exported by this module, as pyright special-cases it.
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# For this raisin it must be imported directly from typing_extension where used.
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# See https://github.com/microsoft/pyright/issues/4197
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from typing_extensions import TypeAlias
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if sys.version_info >= (3, 8):
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from typing import Protocol
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else:
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from typing_extensions import Protocol
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T = TypeVar("T")
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FutureT: TypeAlias = Union["asyncio.Future[T]", Generator[Any, None, T], Awaitable[T]]
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if sys.version_info >= (3, 8):
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create_task = asyncio.create_task
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from math import prod
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else:
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def create_task(
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coro: FutureT[T], name: Optional[str] = None
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) -> "asyncio.Future[T]":
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return asyncio.create_task(coro)
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from functools import reduce
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def prod(seq: Sequence[int]) -> int:
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return reduce(int.__mul__, seq, 1)
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if sys.version_info >= (3, 9):
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from zoneinfo import ZoneInfo
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from functools import cache
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from collections import Counter, deque as Deque
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else:
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from typing import Counter, Deque
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from functools import lru_cache
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from backports.zoneinfo import ZoneInfo
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cache = lru_cache(maxsize=None)
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if sys.version_info >= (3, 10):
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from typing import TypeGuard
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else:
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from typing_extensions import TypeGuard
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if sys.version_info >= (3, 11):
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from typing import LiteralString
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else:
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from typing_extensions import LiteralString
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__all__ = [
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"Counter",
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"Deque",
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"LiteralString",
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"Protocol",
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"TypeGuard",
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"ZoneInfo",
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"cache",
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"create_task",
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"prod",
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]
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