HTTP Statuscode Lookup script

hsl.py

#!/usr/bin/python3
# This script requires python3 and BeautifulSoup.
# BS can be installed with pip3 install beautifulsoup4.
from bs4 import BeautifulSoup
import json
import urllib.request
import sys
import os
import io

def createCache():
    # Scrape site
    url = "https://httpstatuses.com"
    
    req = urllib.request.Request(
        url, 
        data=None, 
        headers={
            'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.47 Safari/537.36'
        }
    )
    
    content = urllib.request.urlopen(req)
    
    soup = BeautifulSoup(content, 'html.parser')
    # Get all stores
    statusCodes = soup.find_all("li")
    
    # Sort through stores and calculate time available.
    for result in statusCodes:
        statusCode = result.find("span")
        desc = result
    
        if statusCode is None:
            continue
        descString = desc.text.replace("</a>", "").split(" ", 1)[1]
    
        cache[statusCode.string] = descString
        
    with open("cache.json", "w") as _cache:
        json.dump(cache, _cache, indent=4)

    return cache

if os.path.isfile('cache.json') is False and os.access('cache.json', os.R_OK) is False:
    print ("Creating cache, one second")
    with io.open('cache.json', 'w') as _cache:
        _cache.write(json.dumps({}))

with open("cache.json") as _cache:
    cache = json.load(_cache)

if bool(cache) is False:
    cache = createCache()
    print("Cache created")

if len(sys.argv) is 2:
    if sys.argv[1] in cache:
        print("Code", sys.argv[1], "means", cache[sys.argv[1]])
    else:
        print("Unknown code")
else:
    print("No code provided! Use ./hsl.py <status-code>")