Python 3.7 example without some types

20-concurrency/primes/threads_py37.py

@@ -0,0 +1,39 @@
+from time import perf_counter
+from typing import Tuple, List, NamedTuple
+from threading import Thread
+from queue import SimpleQueue
+
+from primes import is_prime, NUMBERS
+
+class Result(NamedTuple):  # <3>
+    flag: bool
+    elapsed: float
+
+def check(n: int) -> Result:  # <5>
+    t0 = perf_counter()
+    res = is_prime(n)
+    return Result(res, perf_counter() - t0)
+
+def job(n: int, results: SimpleQueue) -> None:  # <6>
+    results.put((n, check(n)))  # <7>
+
+def main() -> None:
+    t0 = perf_counter()
+    results = SimpleQueue()  # type: ignore
+    workers: List[Thread] = []  # <2>
+
+    for n in NUMBERS:
+        worker = Thread(target=job, args=(n, results))  # <3>
+        worker.start()  # <4>
+        workers.append(worker)  # <5>
+
+    for _ in workers:  # <6>
+        n, (prime, elapsed) = results.get()  # <7>
+        label = 'P' if prime else ' '
+        print(f'{n:16}  {label} {elapsed:9.6f}s')
+
+    time = perf_counter() - t0
+    print('Total time:', f'{time:0.2f}s')
+
+if __name__ == '__main__':
+    main()