dalmo.py

#!/usr/bin/env python3
import csv
import requests
from bs4 import BeautifulSoup

f = open("dalmo.csv", "w")
csvwriter = csv.writer(f)

r = requests.post("http://www.acara.org.ar/guiaprecios/ver_precios.php", data={ "marID": '0' })
soup = BeautifulSoup(r.text, 'html.parser')

for table in soup.find_all("table", class_="texto12"):
    for row in table.find_all("tr"):
        d = [ data.text.strip() for data in row.find_all("td") ]
        csvwriter.writerow(d)

f.close()