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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from collections.abc import ItemsView, Iterable, KeysView, Set, ValuesView
def _abc_itemsview_register(view_cls):
ItemsView.register(view_cls)
def _abc_keysview_register(view_cls):
KeysView.register(view_cls)
def _abc_valuesview_register(view_cls):
ValuesView.register(view_cls)
def _viewbaseset_richcmp(view, other, op):
if op == 0: # <
if not isinstance(other, Set):
return NotImplemented
return len(view) < len(other) and view <= other
elif op == 1: # <=
if not isinstance(other, Set):
return NotImplemented
if len(view) > len(other):
return False
for elem in view:
if elem not in other:
return False
return True
elif op == 2: # ==
if not isinstance(other, Set):
return NotImplemented
return len(view) == len(other) and view <= other
elif op == 3: # !=
return not view == other
elif op == 4: # >
if not isinstance(other, Set):
return NotImplemented
return len(view) > len(other) and view >= other
elif op == 5: # >=
if not isinstance(other, Set):
return NotImplemented
if len(view) < len(other):
return False
for elem in other:
if elem not in view:
return False
return True
def _viewbaseset_and(view, other):
if not isinstance(other, Iterable):
return NotImplemented
if isinstance(view, Set):
view = set(iter(view))
if isinstance(other, Set):
other = set(iter(other))
if not isinstance(other, Set):
other = set(iter(other))
return view & other
def _viewbaseset_or(view, other):
if not isinstance(other, Iterable):
return NotImplemented
if isinstance(view, Set):
view = set(iter(view))
if isinstance(other, Set):
other = set(iter(other))
if not isinstance(other, Set):
other = set(iter(other))
return view | other
def _viewbaseset_sub(view, other):
if not isinstance(other, Iterable):
return NotImplemented
if isinstance(view, Set):
view = set(iter(view))
if isinstance(other, Set):
other = set(iter(other))
if not isinstance(other, Set):
other = set(iter(other))
return view - other
def _viewbaseset_xor(view, other):
if not isinstance(other, Iterable):
return NotImplemented
if isinstance(view, Set):
view = set(iter(view))
if isinstance(other, Set):
other = set(iter(other))
if not isinstance(other, Set):
other = set(iter(other))
return view ^ other
def _itemsview_isdisjoint(view, other):
"Return True if two sets have a null intersection."
for v in other:
if v in view:
return False
return True
def _itemsview_repr(view):
lst = []
for k, v in view:
lst.append("{!r}: {!r}".format(k, v))
body = ", ".join(lst)
return "{}({})".format(view.__class__.__name__, body)
def _keysview_isdisjoint(view, other):
"Return True if two sets have a null intersection."
for k in other:
if k in view:
return False
return True
def _keysview_repr(view):
lst = []
for k in view:
lst.append("{!r}".format(k))
body = ", ".join(lst)
return "{}({})".format(view.__class__.__name__, body)
def _valuesview_repr(view):
lst = []
for v in view:
lst.append("{!r}".format(v))
body = ", ".join(lst)
return "{}({})".format(view.__class__.__name__, body)
def _mdrepr(md):
lst = []
for k, v in md.items():
lst.append("'{}': {!r}".format(k, v))
body = ", ".join(lst)
return "<{}({})>".format(md.__class__.__name__, body)