Scrape an Immoweb search URL and e-mail any new results.

ImmowebScraper.py

#!/usr/bin/python3
# Usage:
# - Fill in the settings, then run with `python3 ImmowebScraper.py`.
# - First run won't send any mails (or you'd get dozens at once).
# Requirements:
# - python3
# - selenium
# - phantomjs

import sqlite3
from selenium import webdriver
import smtplib
from email.mime.text import MIMEText

# settings
url = 'http://www.immoweb.be/nl/zoek/huis/te-koop?zips=2300,2440,2460&minprice=200000&maxprice=350000&minroom=3&maxroom=4'
maxpages = 5
emailaddress = 'notarealemail@gmail.com'
smtp_host = 'smtp.gmail.com'
smtp_port = '587'
smtp_mail = 'notarealemail@gmail.com'
smtp_user = 'notarealemail@gmail.com'
smtp_pass = 'ohnoyoudont'


# prep
db = sqlite3.connect('ImmowebScraper.db')
c = db.cursor()
browser = webdriver.PhantomJS('/usr/local/bin/phantomjs')
browser.implicitly_wait(5)
smtpserver = smtplib.SMTP(smtp_host, smtp_port)
smtpserver.ehlo()
smtpserver.starttls()
smtpserver.login(smtp_user, smtp_pass)

# create the immos table
c.execute('CREATE TABLE IF NOT EXISTS immos (id INTEGER PRIMARY KEY UNIQUE NOT NULL);')
db.commit()

# if there are no id's yet, this is the first run
c.execute('SELECT COUNT(*) FROM immos;')
firstRun = c.fetchone()[0] == 0

# zhu li, do the thing
for page in range(1,maxpages+1):
        print('Browsing page {} ...'.format(page))
        browser.get(url + '&page=' + str(page))
        results = browser.find_elements_by_xpath('//div[@id="result"]/div')
        for result in results:
                immoweb_id = result.get_attribute('id')
                c.execute('SELECT COUNT(*) FROM immos WHERE id=:id;', {'id':immoweb_id})
                if c.fetchone()[0] == 0:
                        print('New property found: ID {}! Storing in db.'.format(immoweb_id))
                        c.execute('INSERT INTO immos(id) VALUES (:id);', {'id':immoweb_id})
                        db.commit()
                        if not firstRun:
                                print('Sending mail about new property ID {}.'.format(immoweb_id))
                                immoweb_text = result.find_element_by_tag_name('a').text
                                immoweb_url = result.find_element_by_tag_name('a').get_attribute('href')
                                email = MIMEText(immoweb_text + '\nURL: ' + immoweb_url)
                                email['Subject'] = 'New property on Immoweb: {}'.format(immoweb_id)
                                email['From'] = smtp_user
                                email['To'] = emailaddress
                                smtpserver.sendmail(smtp_user,emailaddress,email.as_string())

smtpserver.quit()
db.close()

How does it work exactly? I'm new to this. Do I change this?
emailaddress = 'notarealemail@gmail.com'
smtp_host = 'smtp.gmail.com'
smtp_port = '587'
smtp_mail = 'notarealemail@gmail.com'
smtp_user = 'notarealemail@gmail.com'
smtp_pass = 'ohnoyoudont'

How does it work exactly? I'm new to this. Do I change this?

Yes, simply replace the values between quotes with your connections details. This is different for every provider though. There is a real probability that this script does not work anymore though, as Immoweb likely changed their looks and feels in the mean time.