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