Pure Python `SimpleQueue.get()` raises `ValueError` when block is false and timeout is given

The docs for SimpleQueue.get() say that timeout is ignored when block is false. The C version does that, but the pure Python version passes timeout to threading.Semaphore.acquire() and fails:

>>> from queue import _PySimpleQueue
>>> _PySimpleQueue().get(block=False, timeout=1)
Traceback (most recent call last):
  ...
ValueError: can't specify timeout for non-blocking acquire

The C version raises Empty here.

A PR is on the way.

Linked PRs

• gh-156477
• gh-156487
• gh-156488
• gh-156489

从纯 Python 的 _PySimpleQueue.get() 实现开始，将其对 block=False 和 timeout 的处理与 C 版本及 SimpleQueue 文档进行比较。当提供 timeout 的非阻塞 get 遵循文档规定的行为并引发 Empty 而不是 ValueError 时，即视为完成；检查 issue 中展示的现有行为。