Chris Angelico wrote:
> On Sun, Jan 31, 2016 at 3:58 PM, Veek. M <vek.m1...@gmail.com> wrote:
>> I'm parsing html and i'm doing:
>>
>> x = root.find_class(...
>> y = root.find_class(..
>> z = root.find_class(..
>>
>> all 3 are likely to fail so typically i'd have to stick it in a try. This
>> is a huge pain for obvious reasons.
>>
>> try:
>> ....
>> except something:
>> x = 'default_1'
>> (repeat 3 times)
>>
>> Is there some other nice way to wrap this stuff up?
>
> I'm not sure what you're using to parse HTML here (there are several
> libraries for doing that), but the first thing I'd look for is an
> option to have it return a default if it doesn't find something - even
> if that default has to be (say) None.
>
> But failing that, you can always write your own wrapper:
>
> def find_class(root, ...):
> try:
> return root.find_class(...)
> except something:
> return 'default_1'
>
> Or have the default as a parameter, if it's different for the different
> ones.
>
> ChrisA
I'm using lxml.html
def parse_page(self, root):
for li_item in root.xpath('//li[re:test(@id, "^item[a-z0-9]+$")]',
namespaces={'re': "http://exslt.org/regular-expressions"}):
description = li_item.find_class('vip')[0].text_content()
link = li_item.find_class('vip')[0].get('href')
price_dollar = li_item.find_class('lvprice prc')
[0].xpath('span')[0].text
bids = li_item.find_class('lvformat')[0].xpath('span')[0].text
tme_time = li_item.find_class('tme')[0].xpath('span')
[0].get('timems')
if tme_time:
time_hrs = int(tme_time)/1000 - time.time()
else:
time_hrs = 'No time found'
shipping = li_item.find_class('lvshipping')
[0].xpath('span/span/span')[0].text_content()"
print('{} {} {} {} {}'.format(link, price_dollar, time_hrs,
shipping, bids))
print('-----------------------------------------------------------------')
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