小编MrJ*_*MrJ的帖子

码

class A(object):
    def a(self):
        raise NotImplementedError

class B(A):
    def a(self):
        return 7

class C(B):
    pass

为什么Pycharm抱怨？

问题概要C类必须实现所有抽象方法

我有一个带有两个asyncio任务的asyncio/Python程序:

• 一个崩溃
• 一个永远持续的.

我希望我的整个程序在第一次崩溃后退出.我不能让它发生.

import asyncio
import time

def infinite_while():
    while True:
        time.sleep(1)


async def task_1():
    await asyncio.sleep(1)
    assert False


async def task_2():
    loop = asyncio.get_event_loop()
    await loop.run_in_executor(None, lambda: infinite_while())


loop = asyncio.get_event_loop()
asyncio.set_event_loop(loop)

tasks = asyncio.gather(task_2(), task_1())
try:
    loop.run_until_complete(tasks)
except (Exception, KeyboardInterrupt) as e:
    print('ERROR', str(e))
    exit()

它打印ERROR但不退出.手动关闭时,程序将打印以下堆栈跟踪:

Error in atexit._run_exitfuncs:
Traceback (most recent call last):
  File "/usr/lib/python3.5/concurrent/futures/thread.py", line 39, in _python_exit
    t.join()
  File "/usr/lib/python3.5/threading.py", line 1054, in join
    self._wait_for_tstate_lock()
  File "/usr/lib/python3.5/threading.py", line 1070, in _wait_for_tstate_lock
    elif lock.acquire(block, timeout): …

考虑以下函数

import typing
def make_list(el : typing.Any):
    return [el, el]

我如何提示它返回

typing.List[type(el)]