the problem of to_yaml

[Pen Ttt]

here is a program
# MIT LICENSE
#
# Copyright (c) 2007 Soledad Penades www.soledadpenades.com
#
# Permission is hereby granted, free of charge, to any person obtaining
a copy
# of this software and associated documentation files (the "Software"),
to deal
# in the Software without restriction, including without limitation the
rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or
sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
IN
# THE SOFTWARE.

require 'rubygems'
require 'hpricot'
require 'open-uri'
doc =
Hpricot(open("http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/EXIF.html"))
#doc = open("EXIF.html") { |f| Hpricot(f) }

rows = []

(doc/"table.inner//tr").each do |row|
cells = []
(row/"td").each do |cell|

if (cell/" span.s").length > 0
values = (cell/"span.s").inner_html.split('<br
/>').collect{ |str|
pair = str.strip.split('=').collect{|val| val.strip}
Hash[pair[0], pair[1]]
}

if(values.length==1)
cells << cell.inner_text
else
cells << values
end

elsif
cells << cell.inner_text
end
end
rows << cells

end

rows.shift

#p rows.to_yaml

File.open('/home/pt/test/hexif.yaml', 'w') { |f|
f << rows.to_yaml
}
when i run ,
pt@pt-laptop:~$ ruby /home/pt/test/row.rb
/home/pt/test/row.rb:61:in `block in <main>': undefined method `to_yaml'
for #<Array:0x9159ad0> (NoMethodError)
from /home/pt/test/row.rb:60:in `open'
from /home/pt/test/row.rb:60:in `<main>'

what's the matter?

 

[Intransition]

Did you:

require 'yaml'