functools_lru_cache_decorator_memoization_quickstart_example.py

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