demos parsing html

#!/usr/bin/env python3
"""
Erstmal nur als Konzept ...
"""
import time
import csv
import datetime
from collections import namedtuple
from functools import wraps
from io import StringIO

import requests
from bs4 import BeautifulSoup

Felder = "datum tag plz stadt uhrzeit ort art".split()
Result = namedtuple("Termine", Felder)


def cache(ttl):
    def wrapper(func):
        result = None
        last = 0

        @wraps(func)
        def inner(*args, **kwargs):
            nonlocal result
            nonlocal last
            if result is None or time.monotonic() > last:
                result = func(*args, **kwargs)
                last = time.monotonic() + ttl
            return result

        return inner

    return wrapper


@cache(3600)
def get_demo_termine():
    time.sleep(2)
    url = "https://demo.terminkalender.top/"
    try:
        req = requests.get(url)
    except Exception as e:
        print(repr(e))
        return
    return BeautifulSoup(req.content, "html.parser")


def demo_termine():
    bs = get_demo_termine()
    for row in bs.find_all("tr"):
        row = row.find_all("td")
        iterator = map(lambda x: x.text.strip(), row)
        try:
            result = Result(*iterator)
        except TypeError:
            continue
        datum_zeit = result.datum + "T" + result.uhrzeit.partition(" ")[0]
        try:
            date = datetime.datetime.fromisoformat(datum_zeit)
        except ValueError:
            continue
        result = Result(date, *result[1:])
        yield result


def get_cities():
    return sorted({result.stadt.title() for result in demo_termine()})


def next_demos():
    jetzt = datetime.datetime.now()
    return [termin for termin in demo_termine() if jetzt < termin.datum]


def by_date(termin):
    return termin.datum


def print_next_demos():
    for termin in sorted(set(next_demos()), key=by_date):
        print(
            f"{termin.datum:%d.%m} | {termin.datum:%H:%M} | {termin.plz:<5} | {termin.stadt:<25} | {termin.ort:<31} | {termin.art}"
        )


def as_csv():
    io = StringIO()
    writer = csv.writer(io)
    writer.writerow(Felder)
    for termin in sorted(next_demos(), key=by_date):
        writer.writerow([termin.datum.isoformat(), *termin[1:]])
    return io.getvalue()


if __name__ == "__main__":
    print_next_demos()