Modernize code to Python 3.6+ and some cleanup

20-concurrency/primes/primes.py

@@ -1,5 +1,4 @@
 import math
-import itertools
 
 
 PRIME_FIXTURE = [
@@ -36,7 +35,7 @@ def is_prime(n) -> bool:
     if n % 2 == 0:
         return False
 
-    root = int(math.floor(math.sqrt(n)))
+    root = math.floor(math.sqrt(n))
     for i in range(3, root + 1, 2):
         if n % i == 0:
             return False

20-concurrency/primes/procs_py37.py

@@ -34,10 +34,10 @@ def main() -> None:
         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()
 # end::PRIMES_PROC_MAIN[]

20-concurrency/primes/spinner_async_nap.py

@@ -18,7 +18,7 @@ async def is_prime(n):
         return False
 
     sleep = asyncio.sleep  # <1>
-    root = int(math.floor(math.sqrt(n)))
+    root = math.floor(math.sqrt(n))
     for i in range(3, root + 1, 2):
         if n % i == 0:
             return False

20-concurrency/primes/spinner_prime_async_nap.py

@@ -18,7 +18,7 @@ async def is_prime(n):
         return False
 
     sleep = asyncio.sleep  # <1>
-    root = int(math.floor(math.sqrt(n)))
+    root = math.floor(math.sqrt(n))
     for i in range(3, root + 1, 2):
         if n % i == 0:
             return False

20-concurrency/primes/spinner_prime_proc.py

@@ -7,7 +7,6 @@
 from multiprocessing import Process, Event
 from multiprocessing import synchronize
 import itertools
-import time
 
 from primes import is_prime
 

20-concurrency/primes/spinner_prime_thread.py

@@ -6,7 +6,6 @@
 
 from threading import Thread, Event
 import itertools
-import time
 
 from primes import is_prime
 

20-concurrency/primes/spinner_thread.py

@@ -7,7 +7,6 @@
 # tag::SPINNER_THREAD_TOP[]
 from threading import Thread, Event
 import itertools
-import time
 
 from primes import is_prime
 

20-concurrency/primes/threads_py37.py

@@ -1,5 +1,5 @@
 from time import perf_counter
-from typing import Tuple, List, NamedTuple
+from typing import List, NamedTuple
 from threading import Thread
 from queue import SimpleQueue