added ar.pycon.org spider for Pycon in Argentina

.gitignore

@@ -2,5 +2,6 @@
 .scrapy
 project.egg-info/
 build/
-
+venv/
+.idea/
 *.json

pycon_speakers/spiders/ar_pycon.py

@@ -0,0 +1,31 @@
+from scrapy.spider import Spider
+from scrapy.http import Request
+from scrapy.selector import Selector
+
+from pycon_speakers.items import Speaker
+
+from datetime import date
+import re
+
+
+class ArPyconSpider(Spider):
+    """A spider to crawl Argentinian Pycon conference speakers.
+    """
+    name = 'ar.pycon.org'
+    from_year = 2011
+    base_url = 'http://ar.pycon.org/{year}/stats/attendees'
+
+    def start_requests(self):
+        current_year = date.today().year
+        for year in range(self.from_year, current_year):
+            url = self.base_url.format(year=year)
+            yield Request(url)
+
+    def parse(self, response):
+        selector = Selector(response)
+        year = re.search(r'/(\d+)/', response.url).group(1)
+        return [Speaker(name=speaker,
+                        conference=self.name,
+                        year=year)
+                for speaker in selector.xpath('//table[position()>1]'
+                    '//tr[position()>1]//td[position()=1]//text()').extract()]