Fecth Url Question

[Chrovan]

Hi all, I'm studying Python and I should write a function in Python that check whether a user has fetched some url or not through his web browser. I read about the implementation of a fetch(url) function as follows:

_cache = {}
def fetch(url):
    user = os.environ['USER']
    if user not in _cache:
        _cache[user] = {}
    if url not in _cache[user]:
        _cache[user][url] = requests.get(url).content
    return _cache[user][url]

and I'm trying to figure out how to modify this kind of function in order it checks wether a user has fetched some url or not, assuming that fetching a resource from web might take 0.1 seconds, while fetching it on the cache provides an instant result.

It should be something like:

import sys # ignore
sys.path.insert(0,'.') # ignore
from Root.fetch import fetch


def did_fetch(user, url):
    pass #REQUIRED FUNCTION THAT RETURN IF URL HAS BEEN FECTHED BY USER

with the function to be implemented inside.

Thank you very much in advance for any help!