ch20 examples

20-concurrency/primes/spinner_async_nap.py

@@ -1,58 +0,0 @@
-# spinner_async_experiment.py
-
-# credits: Example by Luciano Ramalho inspired by
-# Michele Simionato's multiprocessing example in the python-list:
-# https://mail.python.org/pipermail/python-list/2009-February/675659.html
-
-import asyncio
-import itertools
-import math
-
-# tag::SPINNER_ASYNC_NAP[]
-async def is_prime(n):
-    if n < 2:
-        return False
-    if n == 2:
-        return True
-    if n % 2 == 0:
-        return False
-
-    sleep = asyncio.sleep  # <1>
-    root = math.floor(math.sqrt(n))
-    for i in range(3, root + 1, 2):
-        if n % i == 0:
-            return False
-        if i % 100_000 == 1:  # <2>
-            await sleep(0)
-    return True
-# end::SPINNER_ASYNC_NAP[]
-
-
-async def spin(msg: str) -> None:
-    for char in itertools.cycle(r'\|/-'):
-        status = f'\r{char} {msg}'
-        print(status, flush=True, end='')
-        try:
-            await asyncio.sleep(.1)
-        except asyncio.CancelledError:
-            break
-    blanks = ' ' * len(status)
-    print(f'\r{blanks}\r', end='')
-
-async def slow() -> int:
-    await is_prime(5_000_111_000_222_021)  # <4>
-    return 42
-
-async def supervisor() -> int:
-    spinner = asyncio.create_task(spin('thinking!'))  # <1>
-    print('spinner object:', spinner)  # <2>
-    result = await slow()  # <3>
-    spinner.cancel()  # <5>
-    return result
-
-def main() -> None:
-    result = asyncio.run(supervisor())
-    print('Answer:', result)
-
-if __name__ == '__main__':
-    main()

20-concurrency/primes/spinner_async_prime_no_spin.py

@@ -1,40 +0,0 @@
-# spinner_async_experiment.py
-
-# credits: Example by Luciano Ramalho inspired by
-# Michele Simionato's multiprocessing example in the python-list:
-# https://mail.python.org/pipermail/python-list/2009-February/675659.html
-
-import asyncio
-import itertools
-
-import primes
-
-async def spin(msg: str) -> None:
-    for char in itertools.cycle(r'\|/-'):
-        status = f'\r{char} {msg}'
-        print(status, flush=True, end='')
-        try:
-            await asyncio.sleep(.1)
-        except asyncio.CancelledError:
-            break
-    print('THIS WILL NEVER BE OUTPUT')
-
-# tag::SPINNER_ASYNC_EXPERIMENT[]
-async def slow() -> int:
-    primes.is_prime(5_000_111_000_222_021)  # <4>
-    return 42
-
-async def supervisor() -> int:
-    spinner = asyncio.create_task(spin('thinking!'))  # <1>
-    print('spinner object:', spinner)  # <2>
-    result = await slow()  # <3>
-    spinner.cancel()  # <5>
-    return result
-# end::SPINNER_ASYNC_EXPERIMENT[]
-
-def main() -> None:
-    result = asyncio.run(supervisor())
-    print('Answer:', result)
-
-if __name__ == '__main__':
-    main()

20-concurrency/primes/spinner_thread.py

@@ -1,45 +0,0 @@
-# spinner_thread.py
-
-# credits: Adapted from Michele Simionato's
-# multiprocessing example in the python-list:
-# https://mail.python.org/pipermail/python-list/2009-February/675659.html
-
-# tag::SPINNER_THREAD_TOP[]
-from threading import Thread, Event
-import itertools
-
-from primes import is_prime
-
-def spin(msg: str, done: Event) -> None:  # <1>
-    for char in itertools.cycle(r'\|/-'):  # <2>
-        status = f'\r{char} {msg}'  # <3>
-        print(status, end='', flush=True)
-        if done.wait(.1):  # <4>
-            break  # <5>
-    blanks = ' ' * len(status)
-    print(f'\r{blanks}\r', end='')  # <6>
-
-def slow() -> int:
-    is_prime(5_000_111_000_222_021)  # <7>
-    return 42
-# end::SPINNER_THREAD_TOP[]
-
-# tag::SPINNER_THREAD_REST[]
-def supervisor() -> int:  # <1>
-    done = Event()  # <2>
-    spinner = Thread(target=spin,
-                     args=('thinking!', done))  # <3>
-    print('spinner object:', spinner)  # <4>
-    spinner.start()  # <5>
-    result = slow()  # <6>
-    done.set()  # <7>
-    spinner.join()  # <8>
-    return result
-
-def main() -> None:
-    result = supervisor()  # <9>
-    print('Answer:', result)
-
-if __name__ == '__main__':
-    main()
-# end::SPINNER_THREAD_REST[]