Add explanation for argument 'base_url' #165
Merged
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I found that there was hardly any explanation for the argument 'base_url', which is eventually passed to lxml.etree.fromstring as a base URL for the current page, useful when we need to access relevant pages or resources via relative paths. This argument is not quite important for newcomers but I think it's inappropriate to ignore it in the doc.
I added a simple explanation about it into the script and provided a link to lxml api reference, which may be helpful for those who are interested in the source code.