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 : //lib64/python2.7/lib2to3/fixes/fix_exitfunc.py
"""
Convert use of sys.exitfunc to use the atexit module.
"""

# Author: Benjamin Peterson

from lib2to3 import pytree, fixer_base
from lib2to3.fixer_util import Name, Attr, Call, Comma, Newline, syms


class FixExitfunc(fixer_base.BaseFix):
    keep_line_order = True
    BM_compatible = True

    PATTERN = """
              (
                  sys_import=import_name<'import'
                      ('sys'
                      |
                      dotted_as_names< (any ',')* 'sys' (',' any)* >
                      )
                  >
              |
                  expr_stmt<
                      power< 'sys' trailer< '.' 'exitfunc' > >
                  '=' func=any >
              )
              """

    def __init__(self, *args):
        super(FixExitfunc, self).__init__(*args)

    def start_tree(self, tree, filename):
        super(FixExitfunc, self).start_tree(tree, filename)
        self.sys_import = None

    def transform(self, node, results):
        # First, find the sys import. We'll just hope it's global scope.
        if "sys_import" in results:
            if self.sys_import is None:
                self.sys_import = results["sys_import"]
            return

        func = results["func"].clone()
        func.prefix = u""
        register = pytree.Node(syms.power,
                               Attr(Name(u"atexit"), Name(u"register"))
                               )
        call = Call(register, [func], node.prefix)
        node.replace(call)

        if self.sys_import is None:
            # That's interesting.
            self.warning(node, "Can't find sys import; Please add an atexit "
                             "import at the top of your file.")
            return

        # Now add an atexit import after the sys import.
        names = self.sys_import.children[1]
        if names.type == syms.dotted_as_names:
            names.append_child(Comma())
            names.append_child(Name(u"atexit", u" "))
        else:
            containing_stmt = self.sys_import.parent
            position = containing_stmt.children.index(self.sys_import)
            stmt_container = containing_stmt.parent
            new_import = pytree.Node(syms.import_name,
                              [Name(u"import"), Name(u"atexit", u" ")]
                              )
            new = pytree.Node(syms.simple_stmt, [new_import])
            containing_stmt.insert_child(position + 1, Newline())
            containing_stmt.insert_child(position + 2, new)

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