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"""This module contains several handy functions primarily meant for internal use."""
from __future__ import annotations
import sys
from datetime import datetime, tzinfo
from typing import TypeVar
if sys.version_info >= (3, 9):
from zoneinfo import ZoneInfo
else:
from backports.zoneinfo import ZoneInfo
T = TypeVar("T")
def timezone_repr(timezone: tzinfo) -> str:
if isinstance(timezone, ZoneInfo):
return timezone.key
else:
return repr(timezone)
def absolute_datetime_diff(dateval1: datetime, dateval2: datetime) -> float:
return dateval1.timestamp() - dateval2.timestamp()
def qualified_name(cls: type) -> str:
module = getattr(cls, "__module__", None)
if module is None or module == "builtins":
return cls.__qualname__
else:
return f"{module}.{cls.__qualname__}"
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