I am from Venezuela and some months ago we had presidential elections.
The opposition, which is in someway my tendency (I am tired of this goverment), called a fraud. So in order to check that my self i made a crawler for the web page (www.cne.gob.ve/resultado_presidencial_2013/r/1/reg_000000.html) with the results in order to gather and analyze them.
#!/usr/bin/python
# -*- coding: utf-8 -*-
import requests
import re
import threading
paths_re = re.compile('<s*li\s+class="region-nav-item"><a\s+id="region_ref"\s+href="(.*)"\s*>(.*)<\s*/a\s*>\s*<\s*/li\s*>', re.IGNORECASE)
values_re = re.compile('<tr\s+class="tbsubtotalrow"\s*>\s*<td\s+class="lightRowContent"\s+align="center"\s*>\s*<img\s+src=".+"\s+alt=""\s+width="50"\s+/>\s*
\s*<td\s+class="lightRowContent">\s*<table\s+width="100%">\s*<\s*tr\s*>\s*<\s*td\s+align="left"\s*>\s*<\s*a\s+href="javascript:showCandidateInfo\(\d\);"\s*>(.*)<\s*/a\s*>\s*<\s*/td\s*>\s*<\s*/tr\s*>(\s*<\s*tr\s*>\s*<\s*td\s*>\s*<\s*font\s+color="\#990000"\s*>\s*Adjudicado\s*<\s*/font\s*>\s*<\s*/td\s*>\s*<\s*/tr\s*>\s*|\s*)<\s*/table\s*>\s*<\s*/td\s*>\s*<\s*td\s+class="lightRowContent"\s+align="right"\s*>\s*<\s*span\s*>(.*)<\s*/span\s*>\s*<\s*/td>\s*<\s*td\s+class="lightRowContent"\s+align="right"\s*>\s*<\s*span\s*>(.*)<\s*/span\s*>\s*<\s*/td>\s*', re.IGNORECASE)
filter_re = re.compile('%|\.|\s')
main_url = 'http://www.cne.gob.ve/resultado_presidencial_2013/r/1/'
depth_map = ['All', 'State', 'Municipality', 'County', 'Center', 'Table']
separator = '\t'
outfiles = []
outfilename = 'electionsdata'
qttythread = 6
rthreads = []
generalfile = open(outfilename, 'w')
firstorder = dict()
def crawl_page(url, region, depth, file_to_write):
page = requests.get(url)
paths = paths_re.findall(page.text)
values = values_re.findall(page.text)
if region == separator:
names = map(lambda v: v[0], values)
counter = 0
for name in names:
firstorder[name] = counter
counter += 1
firstorder = map(lambda v: v[0], values)
print_headers(file_to_write, names)
print_info(file_to_write, region, values, depth)
if region == separator:
chunked_lists = chunk_list(paths, (len(paths) + (qttythread - len(paths) % qttythread)) / qttythread)
threadn = 0
for chunked_list in chunked_lists:
t = threading.Thread(target=recursive_calls, args=(chunked_list, region, depth, outfiles[threadn], ))
t.start()
rthreads.append(t)
threadn += 1
else:
recursive_calls(paths, region, depth, file_to_write)
def recursive_calls(paths, region, depth, file_to_write):
savedregion = region
for path in paths:
pathsurl = path[0]
pathsfor = path[1]
region = savedregion + separator + pathsfor
print region
crawl_page(main_url + pathsurl, region, depth + 1, file_to_write)
def chunk_list(l, chunksize):
result = []
for i in xrange(0, len(l), chunksize):
result.append(l[i:i+chunksize])
return result
def print_headers(file_to_write, names):
result = 'Type'
for region_type in depth_map:
result += separator + region_type
for name in names:
result += separator + name + ' value\t' + name + ' %'
file_to_write.write(result + '\n')
def print_info(file_to_write, region, values, depth):
order_values(values)
result = depth_map[depth] + region
for i in xrange(len(depth_map) - depth - 1):
result += separator
for value in values:
result += separator + clean_number_srt(value[2]) + separator + clean_number_srt(value[3])
file_to_write.write(result + '\n')
def order_values(values):
position = 0
while position < len(values):
needed_position = firstorder[values[position][0]]
if position == needed_position:
position += 1
else:
swap(values, position, needed_position)
def swap(l, i, j):
aux = l[i]
l[i] = l[j]
l[j] = aux
def clean_number_srt(number_str):
return filter_re.sub('', number_str).replace(',', '.')
if __name__ == "__main__":
for i in xrange(qttythread):
outfile = open(outfilename + str(i), 'w')
outfiles.append(outfile)
crawl_page(main_url + 'reg_000000.html', separator, 0, generalfile)
for rthread in rthreads:
rthread.join()
for outfile in outfiles:
outfile.close()
generalfile.close()
In the end, i didn’t run it. I think this final version is pretty complete and can be used for another variety of things, thus I am sharing the code :). It use a number of threads and check the pages in a recursive way writing to different files. The regular expressions are pretty ugly, but i didn’t want to use a HTML parser or something like that.
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