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# Wolfram Alpha (Maths)
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#
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# @website http://www.wolframalpha.com
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# @provide-api yes (http://api.wolframalpha.com/v2/)
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#
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# @using-api yes
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# @results XML
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# @stable yes
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# @parse result
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from urllib import urlencode
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from lxml import etree
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# search-url
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base_url = 'http://api.wolframalpha.com/v2/query'
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search_url = base_url + '?appid={api_key}&{query}&format=plaintext'
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api_key = ''
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# do search-request
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def request(query, params):
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params['url'] = search_url.format(query=urlencode({'input': query}),
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api_key=api_key)
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return params
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# replace private user area characters to make text legible
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def replace_pua_chars(text):
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pua_chars = {u'\uf74c': 'd',
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u'\uf74d': u'\u212f',
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u'\uf74e': 'i',
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u'\uf7d9': '='}
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for k, v in pua_chars.iteritems():
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text = text.replace(k, v)
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return text
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# get response from search-request
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def response(resp):
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results = []
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search_results = etree.XML(resp.content)
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# return empty array if there are no results
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if search_results.xpath('/queryresult[attribute::success="false"]'):
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return []
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# parse result
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result = search_results.xpath('//pod[attribute::primary="true"]/subpod/plaintext')[0].text
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result = replace_pua_chars(result)
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# append result
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# TODO: shouldn't it bind the source too?
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results.append({'answer': result})
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# return results
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return results
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