import os
import platform
import sys
import tempfile
import urllib.parse
import urllib.request
from concurrent.futures import ThreadPoolExecutor

print(platform.platform())
print("Python", sys.version)

n = 10

with tempfile.TemporaryDirectory() as d:
    urls = []
    for i in range(n):
        fn = os.path.join(d, "%03d.txt" % i)
        with open(fn, "wt") as f:
            f.write("contents of %d\n" % i)
        urls.append(urllib.parse.urlunparse(("file", "", fn, "", "", "")))

    def slurp_url(u):
        with urllib.request.urlopen(u):
            pass

    with ThreadPoolExecutor(max_workers=len(urls)) as P:
        list(P.map(slurp_url, urls))