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from typing import Tuple
from typing import Union
import pytzdata
from .local_timezone import get_local_timezone
from .local_timezone import set_local_timezone
from .local_timezone import test_local_timezone
from .timezone import UTC
from .timezone import FixedTimezone as _FixedTimezone
from .timezone import Timezone as _Timezone
PRE_TRANSITION = "pre"
POST_TRANSITION = "post"
TRANSITION_ERROR = "error"
timezones = pytzdata.timezones # type: Tuple[str, ...]
_tz_cache = {}
def timezone(name, extended=True): # type: (Union[str, int], bool) -> _Timezone
"""
Return a Timezone instance given its name.
"""
if isinstance(name, int):
return fixed_timezone(name)
if name.lower() == "utc":
return UTC
if name in _tz_cache:
return _tz_cache[name]
tz = _Timezone(name, extended=extended)
_tz_cache[name] = tz
return tz
def fixed_timezone(offset): # type: (int) -> _FixedTimezone
"""
Return a Timezone instance given its offset in seconds.
"""
if offset in _tz_cache:
return _tz_cache[offset] # type: ignore
tz = _FixedTimezone(offset)
_tz_cache[offset] = tz
return tz
def local_timezone(): # type: () -> _Timezone
"""
Return the local timezone.
"""
return get_local_timezone()
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