pereja.py

# install beautifulsoup4, requests, lxml
import re
import json
from pathlib import Path
from urllib.parse import urlencode
import requests
from bs4 import BeautifulSoup

# your user hash and token for Pushover
user = '<user>'
token = '<token>'

# temporary file to prevent multiple notifications
tmp_file = Path('/tmp/pereja')
target_uri = 'https://perejastore.com/limon-kolonyalari-72'

tmp_prods = set([])

if tmp_file.exists():
    try:
        with tmp_file.open('r') as f:
            tmp_prods = set(json.load(f))
    except:
        pass
else:
    with tmp_file.open('w') as f:
        f.write(json.dumps([]))


def get_products(pg):
    return pg.find_all('div', class_='productItem')


def is_target_product(prd):
    return prd.find('a', class_='TukendiIco') is None


def get_product_name(prd):
    return re.sub(r'Limon\s+Çiçeği\s+Kolonyası\s+', '', prd.find('div', class_='productName').text)

session = requests.session()
res = session.get(target_uri)

page = BeautifulSoup(res.text, 'lxml')

products_in_stock = set(map(get_product_name, filter(is_target_product, get_products(page))))
products_text = json.dumps(list(products_in_stock))

with tmp_file.open('r+') as f:
    diff = list(tmp_prods.symmetric_difference(products_in_stock))
    # send notification only if file contents do not match
    if len(products_in_stock) > 0 and len(diff) != 0:
        message = urlencode({
            'user': user,
            'token': token,
            'title': 'PEREJA',
            'priority': 1,
            'message': products_text,
            'url': target_uri
        })

        pres = session.post("https://api.pushover.net/1/messages.json", message)

        if pres.status_code == 200:
            f.write(products_text)
    elif len(products_in_stock) == 0:
        f.write(products_text)