晋太元中,武陵人捕鱼为业。缘溪行,忘路之远近。忽逢桃花林,夹岸数百步,中无杂树,芳草鲜美,落英缤纷。渔人甚异之,复前行,欲穷其林。 林尽水源,便得一山,山有小口,仿佛若有光。便舍船,从口入。初极狭,才通人。复行数十步,豁然开朗。土地平旷,屋舍俨然,有良田、美池、桑竹之属。阡陌交通,鸡犬相闻。其中往来种作,男女衣着,悉如外人。黄发垂髫,并怡然自乐。 见渔人,乃大惊,问所从来。具答之。便要还家,设酒杀鸡作食。村中闻有此人,咸来问讯。自云先世避秦时乱,率妻子邑人来此绝境,不复出焉,遂与外人间隔。问今是何世,乃不知有汉,无论魏晋。此人一一为具言所闻,皆叹惋。余人各复延至其家,皆出酒食。停数日,辞去。此中人语云:“不足为外人道也。”(间隔 一作:隔绝) 既出,得其船,便扶向路,处处志之。及郡下,诣太守,说如此。太守即遣人随其往,寻向所志,遂迷,不复得路。 南阳刘子骥,高尚士也,闻之,欣然规往。未果,寻病终。后遂无问津者。
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# Copyright 2016–2021 Julien Danjou
# Copyright 2016 Joshua Harlow
# Copyright 2013-2014 Ray Holder
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import abc
import typing
from pip._vendor.tenacity import _utils
if typing.TYPE_CHECKING:
import threading
from pip._vendor.tenacity import RetryCallState
class stop_base(abc.ABC):
"""Abstract base class for stop strategies."""
@abc.abstractmethod
def __call__(self, retry_state: "RetryCallState") -> bool:
pass
def __and__(self, other: "stop_base") -> "stop_all":
return stop_all(self, other)
def __or__(self, other: "stop_base") -> "stop_any":
return stop_any(self, other)
StopBaseT = typing.Union[stop_base, typing.Callable[["RetryCallState"], bool]]
class stop_any(stop_base):
"""Stop if any of the stop condition is valid."""
def __init__(self, *stops: stop_base) -> None:
self.stops = stops
def __call__(self, retry_state: "RetryCallState") -> bool:
return any(x(retry_state) for x in self.stops)
class stop_all(stop_base):
"""Stop if all the stop conditions are valid."""
def __init__(self, *stops: stop_base) -> None:
self.stops = stops
def __call__(self, retry_state: "RetryCallState") -> bool:
return all(x(retry_state) for x in self.stops)
class _stop_never(stop_base):
"""Never stop."""
def __call__(self, retry_state: "RetryCallState") -> bool:
return False
stop_never = _stop_never()
class stop_when_event_set(stop_base):
"""Stop when the given event is set."""
def __init__(self, event: "threading.Event") -> None:
self.event = event
def __call__(self, retry_state: "RetryCallState") -> bool:
return self.event.is_set()
class stop_after_attempt(stop_base):
"""Stop when the previous attempt >= max_attempt."""
def __init__(self, max_attempt_number: int) -> None:
self.max_attempt_number = max_attempt_number
def __call__(self, retry_state: "RetryCallState") -> bool:
return retry_state.attempt_number >= self.max_attempt_number
class stop_after_delay(stop_base):
"""Stop when the time from the first attempt >= limit."""
def __init__(self, max_delay: _utils.time_unit_type) -> None:
self.max_delay = _utils.to_seconds(max_delay)
def __call__(self, retry_state: "RetryCallState") -> bool:
if retry_state.seconds_since_start is None:
raise RuntimeError("__call__() called but seconds_since_start is not set")
return retry_state.seconds_since_start >= self.max_delay