renumbering chapters >= 19

19-concurrency/primes/sequential.py

@@ -0,0 +1,34 @@
+#!/usr/bin/env python3
+
+"""
+sequential.py: baseline for comparing sequential, multiprocessing,
+and threading code for CPU-intensive work.
+"""
+
+from time import perf_counter
+from typing import NamedTuple
+
+from primes import is_prime, NUMBERS
+
+class Result(NamedTuple):  # <1>
+    prime: bool
+    elapsed: float
+
+def check(n: int) -> Result:  # <2>
+    t0 = perf_counter()
+    prime = is_prime(n)
+    return Result(prime, perf_counter() - t0)
+
+def main() -> None:
+    print(f'Checking {len(NUMBERS)} numbers sequentially:')
+    t0 = perf_counter()
+    for n in NUMBERS:  # <3>
+        prime, elapsed = check(n)
+        label = 'P' if prime else ' '
+        print(f'{n:16}  {label} {elapsed:9.6f}s')
+
+    elapsed = perf_counter() - t0  # <4>
+    print(f'Total time: {elapsed:.2f}s')
+
+if __name__ == '__main__':
+    main()