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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Current File : //usr/lib64/python2.7/xml/dom/minicompat.py
"""Python version compatibility support for minidom."""

# This module should only be imported using "import *".
#
# The following names are defined:
#
#   NodeList      -- lightest possible NodeList implementation
#
#   EmptyNodeList -- lightest possible NodeList that is guaranteed to
#                    remain empty (immutable)
#
#   StringTypes   -- tuple of defined string types
#
#   defproperty   -- function used in conjunction with GetattrMagic;
#                    using these together is needed to make them work
#                    as efficiently as possible in both Python 2.2+
#                    and older versions.  For example:
#
#                        class MyClass(GetattrMagic):
#                            def _get_myattr(self):
#                                return something
#
#                        defproperty(MyClass, "myattr",
#                                    "return some value")
#
#                    For Python 2.2 and newer, this will construct a
#                    property object on the class, which avoids
#                    needing to override __getattr__().  It will only
#                    work for read-only attributes.
#
#                    For older versions of Python, inheriting from
#                    GetattrMagic will use the traditional
#                    __getattr__() hackery to achieve the same effect,
#                    but less efficiently.
#
#                    defproperty() should be used for each version of
#                    the relevant _get_<property>() function.

__all__ = ["NodeList", "EmptyNodeList", "StringTypes", "defproperty"]

import xml.dom

try:
    unicode
except NameError:
    StringTypes = type(''),
else:
    StringTypes = type(''), type(unicode(''))


class NodeList(list):
    __slots__ = ()

    def item(self, index):
        if 0 <= index < len(self):
            return self[index]

    def _get_length(self):
        return len(self)

    def _set_length(self, value):
        raise xml.dom.NoModificationAllowedErr(
            "attempt to modify read-only attribute 'length'")

    length = property(_get_length, _set_length,
                      doc="The number of nodes in the NodeList.")

    # For backward compatibility
    def __setstate__(self, state):
        if state is None:
            state = []
        self[:] = state


class EmptyNodeList(tuple):
    __slots__ = ()

    def __add__(self, other):
        NL = NodeList()
        NL.extend(other)
        return NL

    def __radd__(self, other):
        NL = NodeList()
        NL.extend(other)
        return NL

    def item(self, index):
        return None

    def _get_length(self):
        return 0

    def _set_length(self, value):
        raise xml.dom.NoModificationAllowedErr(
            "attempt to modify read-only attribute 'length'")

    length = property(_get_length, _set_length,
                      doc="The number of nodes in the NodeList.")


def defproperty(klass, name, doc):
    get = getattr(klass, ("_get_" + name)).im_func
    def set(self, value, name=name):
        raise xml.dom.NoModificationAllowedErr(
            "attempt to modify read-only attribute " + repr(name))
    assert not hasattr(klass, "_set_" + name), \
           "expected not to find _set_" + name
    prop = property(get, set, doc=doc)
    setattr(klass, name, prop)

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