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　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。 . Prv8 Shell

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"""
Optional fixer to transform set() calls to set literals.
"""

# Author: Benjamin Peterson

from lib2to3 import fixer_base, pytree
from lib2to3.fixer_util import token, syms



class FixSetLiteral(fixer_base.BaseFix):

    BM_compatible = True
    explicit = True

    PATTERN = """power< 'set' trailer< '('
                     (atom=atom< '[' (items=listmaker< any ((',' any)* [',']) >
                                |
                                single=any) ']' >
                     |
                     atom< '(' items=testlist_gexp< any ((',' any)* [',']) > ')' >
                     )
                     ')' > >
              """

    def transform(self, node, results):
        single = results.get("single")
        if single:
            # Make a fake listmaker
            fake = pytree.Node(syms.listmaker, [single.clone()])
            single.replace(fake)
            items = fake
        else:
            items = results["items"]

        # Build the contents of the literal
        literal = [pytree.Leaf(token.LBRACE, u"{")]
        literal.extend(n.clone() for n in items.children)
        literal.append(pytree.Leaf(token.RBRACE, u"}"))
        # Set the prefix of the right brace to that of the ')' or ']'
        literal[-1].prefix = items.next_sibling.prefix
        maker = pytree.Node(syms.dictsetmaker, literal)
        maker.prefix = node.prefix

        # If the original was a one tuple, we need to remove the extra comma.
        if len(maker.children) == 4:
            n = maker.children[2]
            n.remove()
            maker.children[-1].prefix = n.prefix

        # Finally, replace the set call with our shiny new literal.
        return maker

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