　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。 sh-3ll

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sh-3ll 1.0

DIR:/opt/alt/ruby18/share/ri/1.8/system/Hash/

Current File : //opt/alt/ruby18/share/ri/1.8/system/Hash/fetch-i.yaml

--- !ruby/object:RI::MethodDescription 
aliases: []

block_params: 
comment: 
- !ruby/struct:SM::Flow::P 
  body: "Returns a value from the hash for the given key. If the key can't be found, there are several options: With no other arguments, it will raise an <tt>IndexError</tt> exception; if <em>default</em> is given, then that will be returned; if the optional code block is specified, then that will be run and its result returned."
- !ruby/struct:SM::Flow::VERB 
  body: "   h = { &quot;a&quot; =&gt; 100, &quot;b&quot; =&gt; 200 }\n   h.fetch(&quot;a&quot;)                            #=&gt; 100\n   h.fetch(&quot;z&quot;, &quot;go fish&quot;)                 #=&gt; &quot;go fish&quot;\n   h.fetch(&quot;z&quot;) { |el| &quot;go fish, #{el}&quot;}   #=&gt; &quot;go fish, z&quot;\n"
- !ruby/struct:SM::Flow::P 
  body: The following example shows that an exception is raised if the key is not found and a default value is not supplied.
- !ruby/struct:SM::Flow::VERB 
  body: "   h = { &quot;a&quot; =&gt; 100, &quot;b&quot; =&gt; 200 }\n   h.fetch(&quot;z&quot;)\n"
- !ruby/struct:SM::Flow::P 
  body: <em>produces:</em>
- !ruby/struct:SM::Flow::VERB 
  body: "   prog.rb:2:in `fetch': key not found (IndexError)\n    from prog.rb:2\n"
full_name: Hash#fetch
is_singleton: false
name: fetch
params: |
  hsh.fetch(key [, default] )       => obj
  hsh.fetch(key) {| key | block }   => obj

visibility: public