小编Cha*_*nel的帖子

我有一个抓取工具（基于 Python 3.4.2 和 asyncio/aiohttp 库）和一堆链接（> 10K）来检索一些少量数据。部分爬虫代码：

@asyncio.coroutine
def prepare(self, links):
    semaphore = asyncio.Semaphore(self.limit_concurrent)
    tasks = []
    result = []

    tasks = [self.request_data(link, semaphore) for link in links]

    for task in asyncio.as_completed(tasks):
        response = yield from task
        if response:
            result.append(response)
        task.close()
    return result

@asyncio.coroutine
def request_data(self, link, semaphore):

    ...

    with (yield from semaphore):
        while True:
            counter += 1
            if counter >= self.retry:
                break
            with aiohttp.Timeout(self.timeout):
                try:
                    response = yield from self.session.get(url, headers=self.headers)
                    body = yield from response.read()
                    break
                except asyncio.TimeoutError …

我在 django 2.2 中运行命令时遇到问题。该应用程序在INSTALLED_APPS. 我收到一条消息：

Unknown command: 'my_command'
Type 'manage.py help' for usage.

下面是项目的结构：

project/
    app/
       managment/
           commands/
               my_command.py
       models.py
       views.py
       ...

my_command.py

from django.core.management.base import BaseCommand


class Command(BaseCommand):
    help = 'My custom command'

    def handle(self, *args, **options):
    code here