I will try to explain the best way:
To load a value in loader I use the following code:
rLoader.add_value('tric',HTML.xpath('.//table[@class="resultTotal"]/tr/td[6]').re(r'\xa3(\d+\.\d+)'))
It´s ok, the code work fine. The values between td tags are loaded in the
loader, <td>11.8</td>.
Sometimes, between <td> tags there isn't a numeric value, for example two
dashes <td>--</td>. In this case, as expected, nothing it's loaded, it's
ok.
When I try to print item[tric] an error occurs: exceptions.KeyError: 'tric'.
However the tric attribute exists in item definition.
How can I fix it the right way? I would like print item[tric] and get 0
value or null.
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