352 lines
11 KiB
Python
352 lines
11 KiB
Python
#!/usr/bin/env python3
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"""
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Bezrealitky.cz scraper.
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Stáhne byty na prodej v Praze a vyfiltruje podle kritérií.
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Výstup: byty_bezrealitky.json
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"""
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from __future__ import annotations
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import json
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import math
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import re
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import time
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import urllib.request
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from pathlib import Path
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# ── Konfigurace ─────────────────────────────────────────────────────────────
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MAX_PRICE = 13_500_000
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MIN_AREA = 69
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MIN_FLOOR = 2
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PER_PAGE = 15 # Bezrealitky vrací 15 na stránku
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# Dispozice které chceme
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WANTED_DISPOSITIONS = {
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"DISP_3_KK", "DISP_3_1",
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"DISP_4_KK", "DISP_4_1",
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"DISP_5_KK", "DISP_5_1",
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"DISP_6",
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"DISP_OTHER", # atypické
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}
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DISPOSITION_LABELS = {
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"DISP_1_KK": "1+kk", "DISP_1_1": "1+1",
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"DISP_2_KK": "2+kk", "DISP_2_1": "2+1",
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"DISP_3_KK": "3+kk", "DISP_3_1": "3+1",
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"DISP_4_KK": "4+kk", "DISP_4_1": "4+1",
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"DISP_5_KK": "5+kk", "DISP_5_1": "5+1",
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"DISP_6": "6+",
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"DISP_OTHER": "Atypický",
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}
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CONSTRUCTION_MAP = {
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"BRICK": "Cihlová",
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"PANEL": "Panelová",
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"WOOD": "Dřevostavba",
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"MIXED": "Smíšená",
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"MONTAGE": "Montovaná",
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"STEEL": "Ocelová",
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}
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OWNERSHIP_MAP = {
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"OSOBNI": "Osobní",
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"DRUZSTEVNI": "Družstevní",
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"STATNI": "Státní/obecní",
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}
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HEADERS = {
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"User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
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"Accept": "text/html,application/xhtml+xml",
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"Accept-Language": "cs,en;q=0.9",
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}
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BASE_URL = "https://www.bezrealitky.cz"
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def fetch_page(page: int) -> tuple[list[dict], int]:
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"""
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Fetch a listing page from Bezrealitky.
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Returns (list of advert dicts from Apollo cache, total count).
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"""
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url = f"{BASE_URL}/vypis/nabidka-prodej/byt/praha?page={page}"
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req = urllib.request.Request(url, headers=HEADERS)
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resp = urllib.request.urlopen(req, timeout=30)
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html = resp.read().decode("utf-8")
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match = re.search(
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r'<script id="__NEXT_DATA__" type="application/json">(.*?)</script>',
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html, re.DOTALL
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)
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if not match:
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return [], 0
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data = json.loads(match.group(1))
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cache = data["props"]["pageProps"]["apolloCache"]
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# Extract adverts from cache
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adverts = []
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for key, val in cache.items():
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if key.startswith("Advert:") and isinstance(val, dict) and val.get("__typename") == "Advert":
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adverts.append(val)
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# Get total count from ROOT_QUERY
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total = 0
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root = cache.get("ROOT_QUERY", {})
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for key, val in root.items():
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if "listAdverts" in key and isinstance(val, dict):
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tc = val.get("totalCount")
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if tc and tc > total:
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total = tc
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return adverts, total
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def fetch_detail(uri: str) -> dict | None:
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"""Fetch detail page for a listing."""
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try:
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url = f"{BASE_URL}/nemovitosti-byty-domy/{uri}"
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req = urllib.request.Request(url, headers=HEADERS)
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resp = urllib.request.urlopen(req, timeout=30)
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html = resp.read().decode("utf-8")
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match = re.search(
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r'<script id="__NEXT_DATA__" type="application/json">(.*?)</script>',
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html, re.DOTALL
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)
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if not match:
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return None
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data = json.loads(match.group(1))
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cache = data["props"]["pageProps"]["apolloCache"]
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# Find the full advert in cache
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for key, val in cache.items():
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if key.startswith("Advert:") and isinstance(val, dict):
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# Detail pages have much more fields
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if "construction" in val or "etage" in val or "ownership" in val:
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return val
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except Exception as e:
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print(f" Warning: detail failed for {uri}: {e}")
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return None
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def format_price(price: int) -> str:
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s = str(price)
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parts = []
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while s:
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parts.append(s[-3:])
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s = s[:-3]
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return " ".join(reversed(parts)) + " Kč"
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def load_cache(json_path: str = "byty_bezrealitky.json") -> dict[int, dict]:
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"""Load previously scraped data as cache keyed by hash_id."""
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path = Path(json_path)
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if not path.exists():
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return {}
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try:
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data = json.loads(path.read_text(encoding="utf-8"))
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return {e["hash_id"]: e for e in data if "hash_id" in e}
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except (json.JSONDecodeError, KeyError):
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return {}
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def scrape():
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cache = load_cache()
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print("=" * 60)
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print("Stahuji inzeráty z Bezrealitky.cz")
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print(f"Cena: do {format_price(MAX_PRICE)}")
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print(f"Min. plocha: {MIN_AREA} m²")
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print(f"Patro: od {MIN_FLOOR}. NP")
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print(f"Region: Praha")
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if cache:
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print(f"Cache: {len(cache)} bytů z minulého běhu")
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print("=" * 60)
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# Step 1: Fetch all listing pages
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print("\nFáze 1: Stahování seznamu inzerátů...")
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all_adverts = {} # id -> advert dict (dedup)
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page = 1
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total = None
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while True:
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print(f" Strana {page} ...")
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adverts, total_count = fetch_page(page)
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if total is None and total_count > 0:
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total = total_count
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total_pages = math.ceil(total / PER_PAGE)
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print(f" → Celkem {total} inzerátů, ~{total_pages} stran")
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if not adverts:
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break
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for adv in adverts:
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adv_id = adv.get("id")
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if adv_id and adv_id not in all_adverts:
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all_adverts[adv_id] = adv
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page += 1
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if total and page > math.ceil(total / PER_PAGE):
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break
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time.sleep(0.5)
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print(f"\n Staženo: {len(all_adverts)} unikátních inzerátů")
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# Step 2: Pre-filter by disposition, price, area from list data
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pre_filtered = []
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excluded_disp = 0
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excluded_price = 0
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excluded_area = 0
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excluded_no_gps = 0
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for adv in all_adverts.values():
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disp = adv.get("disposition", "")
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if disp not in WANTED_DISPOSITIONS:
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excluded_disp += 1
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continue
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price = adv.get("price", 0) or 0
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if price > MAX_PRICE or price == 0:
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excluded_price += 1
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continue
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surface = adv.get("surface")
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if surface is not None and surface < MIN_AREA:
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excluded_area += 1
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continue
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gps = adv.get("gps", {})
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if not gps or not gps.get("lat") or not gps.get("lng"):
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excluded_no_gps += 1
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continue
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pre_filtered.append(adv)
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print(f"\nPo předfiltraci:")
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print(f" Vyloučeno (dispozice): {excluded_disp}")
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print(f" Vyloučeno (cena): {excluded_price}")
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print(f" Vyloučeno (plocha): {excluded_area}")
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print(f" Vyloučeno (bez GPS): {excluded_no_gps}")
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print(f" Zbývá: {len(pre_filtered)}")
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# Step 3: Fetch details
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print(f"\nFáze 2: Stahování detailů ({len(pre_filtered)} bytů)...")
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results = []
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excluded_panel = 0
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excluded_floor = 0
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excluded_detail = 0
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cache_hits = 0
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for i, adv in enumerate(pre_filtered):
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uri = adv.get("uri", "")
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if not uri:
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excluded_detail += 1
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continue
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# Check cache — if hash_id exists and price unchanged, reuse
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adv_id = int(adv["id"])
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adv_price = adv.get("price", 0) or 0
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cached = cache.get(adv_id)
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if cached and cached.get("price") == adv_price:
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cache_hits += 1
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results.append(cached)
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continue
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time.sleep(0.4)
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detail = fetch_detail(uri)
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if not detail:
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excluded_detail += 1
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continue
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# Check construction — exclude panel
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construction = detail.get("construction", "")
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if construction == "PANEL":
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excluded_panel += 1
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print(f" ✗ Vyloučen #{adv['id']}: panel")
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continue
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# Check situation — exclude sídliště
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situation = detail.get("situation", "")
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if situation and "HOUSING_ESTATE" in str(situation).upper():
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excluded_panel += 1
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print(f" ✗ Vyloučen #{adv['id']}: sídliště")
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continue
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# Check floor (etage)
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etage = detail.get("etage")
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if etage is not None and etage < MIN_FLOOR:
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excluded_floor += 1
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continue
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gps = adv.get("gps", {})
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disp = adv.get("disposition", "")
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# Get address — key includes locale parameter
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address = ""
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for key in detail:
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if key.startswith("address(") and "withHouseNumber" not in key:
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address = detail[key]
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break
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if not address:
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for key in detail:
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if key.startswith("address("):
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address = detail[key]
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break
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if not address:
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address = adv.get('address({"locale":"CS"})', "Praha")
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result = {
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"hash_id": int(adv["id"]),
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"name": f"Prodej bytu {DISPOSITION_LABELS.get(disp, '?')} {adv.get('surface', '?')} m²",
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"price": adv.get("price", 0),
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"price_formatted": format_price(adv.get("price", 0)),
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"locality": address,
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"lat": gps["lat"],
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"lon": gps["lng"],
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"disposition": DISPOSITION_LABELS.get(disp, "?"),
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"floor": etage,
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"area": adv.get("surface"),
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"building_type": CONSTRUCTION_MAP.get(construction, construction or "neuvedeno"),
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"ownership": OWNERSHIP_MAP.get(detail.get("ownership", ""), detail.get("ownership") or "neuvedeno"),
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"url": f"{BASE_URL}/nemovitosti-byty-domy/{uri}",
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"source": "bezrealitky",
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"image": "",
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}
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results.append(result)
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if (i + 1) % 20 == 0:
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print(f" Zpracováno {i + 1}/{len(pre_filtered)} ...")
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print(f"\n{'=' * 60}")
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print(f"Výsledky Bezrealitky:")
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print(f" Předfiltrováno: {len(pre_filtered)}")
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print(f" Z cache (přeskočeno): {cache_hits}")
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print(f" Vyloučeno (panel/síd): {excluded_panel}")
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print(f" Vyloučeno (patro): {excluded_floor}")
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print(f" Vyloučeno (bez detailu): {excluded_detail}")
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print(f" ✓ Vyhovující byty: {len(results)}")
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print(f"{'=' * 60}")
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return results
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if __name__ == "__main__":
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start = time.time()
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estates = scrape()
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if estates:
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json_path = Path("byty_bezrealitky.json")
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json_path.write_text(
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json.dumps(estates, ensure_ascii=False, indent=2),
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encoding="utf-8",
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)
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elapsed = time.time() - start
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print(f"\n✓ Data uložena: {json_path.resolve()}")
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print(f"⏱ Celkový čas: {elapsed:.0f} s")
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else:
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print("\nŽádné byty z Bezrealitek neodpovídají kritériím :(")
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