update from Atlas

futures/countries/flags2_threadpool.py

@@ -0,0 +1,42 @@
+"""Download flags of top 10 countries by population
+
+ThreadPool version
+
+Sample run::
+
+    $
+
+"""
+
+from concurrent import futures
+
+import tqdm
+
+from flag_utils import main, Counts
+from flags2_sequential import get_flag, download_one
+
+DEFAULT_CONCUR_REQ = 30
+MAX_CONCUR_REQ = 1000
+
+
+def download_many(cc_list, base_url, verbose, concur_req):
+    with futures.ThreadPoolExecutor(concur_req) as executor:
+        to_do = [executor.submit(download_one, cc, base_url, verbose)
+                 for cc in sorted(cc_list)]
+        counts = [0, 0, 0]
+        to_do_iter = futures.as_completed(to_do)
+        if not verbose:
+            to_do_iter = tqdm.tqdm(to_do_iter, total=len(cc_list))
+        for future in to_do_iter:
+            try:
+                res = future.result()
+            except Exception as exc:
+                print('*** Unexpected exception:', exc)
+            else:
+                counts[res.status.value-1] += 1
+
+    return Counts(*counts)
+
+
+if __name__ == '__main__':
+    main(download_many, DEFAULT_CONCUR_REQ, MAX_CONCUR_REQ)