functools_lru_cache_web_page_fetcher_with_caching.py

1from functools import lru_cache
2import urllib.request
3import urllib.error
4
5@lru_cache(maxsize=32)
6def get_pep(num):
7    """Retrieve text of a Python Enhancement Proposal"""
8    resource = f"https://peps.python.org/pep-{num:04d}/"
9    try:
10        with urllib.request.urlopen(resource) as s:
11            return s.read()
12    except urllib.error.HTTPError:
13        return 'Not Found'
14
15for n in 8, 290, 308, 320, 8, 218, 320, 279, 289, 320, 9991:
16    pep = get_pep(n)
17    print(n, len(pep))
18
19print(get_pep.cache_info())