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#!/usr/bin/python
#
# Peteris Krumins (peter@catonmat.net)
# http://www.catonmat.net -- good coders code, great reuse
#
# A Google Search Python library. v1.0
#
# http://www.catonmat.net/blog/python-library-for-google-search/
#
import re
import urllib
from htmlentitydefs import name2codepoint
from BeautifulSoup import BeautifulSoup
from browser import Browser, BrowserError
class SearchError(Exception):
"""
Base class for Google Search exceptions.
"""
pass
class ParseError(SearchError):
"""
Parse error in Google results.
self.msg attribute contains explanation why parsing failed
self.tag attribute contains BeautifulSoup object with the most relevant tag that failed to parse
Thrown only in debug mode
"""
def __init__(self, msg, tag):
self.msg = msg
self.tag = tag
def __str__(self):
return self.msg
def html(self):
return self.tag.prettify()
class SearchResult:
def __init__(self, title, url, desc):
self.title = title
self.url = url
self.desc = desc
def __str__(self):
return 'Google Search Result: "%s"' % self.title
class GoogleSearch(object):
SEARCH_URL_0 = "http://www.google.com/search?hl=en&q=%(query)s&btnG=Google+Search"
NEXT_PAGE_0 = "http://www.google.com/search?hl=en&q=%(query)s&start=%(start)d"
SEARCH_URL_1 = "http://www.google.com/search?hl=en&q=%(query)s&num=%(num)d&btnG=Google+Search"
NEXT_PAGE_1 = "http://www.google.com/search?hl=en&q=%(query)s&num=%(num)d&start=%(start)d"
def __init__(self, query, random_agent=False, debug=False):
self.query = query
self.debug = debug
self.browser = Browser(debug=debug)
self.results_info = None
self.eor = False # end of results
self._page = 0
self._results_per_page = 10
self._last_from = 0
if random_agent:
self.browser.set_random_user_agent()
@property
def num_results(self):
if not self.results_info:
page = self._get_results_page()
self.results_info = self._extract_info(page)
if self.results_info['total'] == 0:
self.eor = True
return self.results_info['total']
def _get_page(self):
return self._page
def _set_page(self, page):
self._page = page
page = property(_get_page, _set_page)
def _get_results_per_page(self):
return self._results_per_page
def _set_results_par_page(self, rpp):
self._results_per_page = rpp
results_per_page = property(_get_results_per_page, _set_results_par_page)
def get_results(self):
""" Gets a page of results """
if self.eor:
return []
page = self._get_results_page()
search_info = self._extract_info(page)
if not self.results_info:
self.results_info = search_info
if self.num_results == 0:
self.eor = True
return []
results = self._extract_results(page)
if not results:
self.eor = True
return []
if self._page > 0 and search_info['from'] == self._last_from:
self.eor = True
return []
if search_info['to'] == search_info['total']:
self.eor = True
self._page += 1
self._last_from = search_info['from']
return results
def _maybe_raise(self, cls, *arg):
if self.debug:
raise cls(*arg)
def _get_results_page(self):
if self._page == 0:
if self._results_per_page == 10:
url = GoogleSearch.SEARCH_URL_0
else:
url = GoogleSearch.SEARCH_URL_1
else:
if self._results_per_page == 10:
url = GoogleSearch.NEXT_PAGE_0
else:
url = GoogleSearch.NEXT_PAGE_1
safe_url = url % { 'query': urllib.quote_plus(self.query),
'start': self._page * self._results_per_page,
'num': self._results_per_page }
try:
page = self.browser.get_page(safe_url)
except BrowserError, e:
raise SearchError, "Failed getting %s: %s" % (e.url, e.error)
return BeautifulSoup(page)
def _extract_info(self, soup):
empty_info = {'from': 0, 'to': 0, 'total': 0}
div_ssb = soup.find('div', id='ssb')
if not div_ssb:
self._maybe_raise(ParseError, "Div with number of results was not found on Google search page", soup)
return empty_info
p = div_ssb.find('p')
if not p:
self._maybe_raise(ParseError, """<p> tag within <div id="ssb"> was not found on Google search page""", soup)
return empty_info
txt = ''.join(p.findAll(text=True))
txt = txt.replace(',', '')
matches = re.search(r'Results (\d+) - (\d+) of (?:about )?(\d+)', txt, re.U)
if not matches:
return empty_info
return {'from': int(matches.group(1)), 'to': int(matches.group(2)), 'total': int(matches.group(3))}
def _extract_results(self, soup):
results = soup.findAll('li', {'class': 'g'})
ret_res = []
for result in results:
eres = self._extract_result(result)
if eres:
ret_res.append(eres)
return ret_res
def _extract_result(self, result):
title, url = self._extract_title_url(result)
desc = self._extract_description(result)
if not title or not url or not desc:
return None
return SearchResult(title, url, desc)
def _extract_title_url(self, result):
#title_a = result.find('a', {'class': re.compile(r'\bl\b')})
title_a = result.find('a')
if not title_a:
self._maybe_raise(ParseError, "Title tag in Google search result was not found", result)
return None, None
title = ''.join(title_a.findAll(text=True))
title = self._html_unescape(title)
url = title_a['href']
match = re.match(r'/url\?q=(http[^&]+)&', url)
if match:
url = urllib.unquote(match.group(1))
return title, url
def _extract_description(self, result):
desc_div = result.find('div', {'class': re.compile(r'\bs\b')})
if not desc_div:
self._maybe_raise(ParseError, "Description tag in Google search result was not found", result)
return None
desc_strs = []
def looper(tag):
if not tag: return
for t in tag:
try:
if t.name == 'br': break
except AttributeError:
pass
try:
desc_strs.append(t.string)
except AttributeError:
desc_strs.append(t)
looper(desc_div)
looper(desc_div.find('wbr')) # BeautifulSoup does not self-close <wbr>
desc = ''.join(s for s in desc_strs if s)
return self._html_unescape(desc)
def _html_unescape(self, str):
def entity_replacer(m):
entity = m.group(1)
if entity in name2codepoint:
return unichr(name2codepoint[entity])
else:
return m.group(0)
def ascii_replacer(m):
cp = int(m.group(1))
if cp <= 255:
return unichr(cp)
else:
return m.group(0)
s = re.sub(r'&#(\d+);', ascii_replacer, str, re.U)
return re.sub(r'&([^;]+);', entity_replacer, s, re.U)
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