小编Moh*_*umi的帖子

最近，我将Django框架的版本从2.0.6to升级3.0，突然在调用python manage.py shell命令后，我得到了这个异常：

导入错误：无法从“django.utils”导入名称“6”（/path-to-project/project/venv/lib/python3.7/site-packages/django/utils/ init .py）

完整跟踪：

Traceback (most recent call last):
  File "manage.py", line 13, in <module>
    execute_from_command_line(sys.argv)
  File "/path-to-project/project/venv/lib/python3.7/site-packages/django/core/management/__init__.py", line 401, in execute_from_command_line
    utility.execute()
  File "/path-to-project/project/venv/lib/python3.7/site-packages/django/core/management/__init__.py", line 377, in execute
    django.setup()
  File "/path-to-project/project/venv/lib/python3.7/site-packages/django/__init__.py", line 24, in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/path-to-project/project/venv/lib/python3.7/site-packages/django/apps/registry.py", line 91, in populate
    app_config = AppConfig.create(entry)
  File "/path-to-project/project/venv/lib/python3.7/site-packages/django/apps/config.py", line 90, in create
    module = import_module(entry)
  File "/usr/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in …

为什么我会收到此错误？ __CODE__

我的docker-compose文件几乎与此相同:https://docs.docker.com/compose/wordpress/

version: '2'
services:
  wordpress:
    image: wordpress:latest
    restart: always
    depends_on:
      - db
    ports:
      - 8080:80
    environment:
      WORDPRESS_DB_PASSWORD: example
      WORDPRESS_DB_HOST: 3306
  db:
    image: mariadb
    restart: always
    environment:
      MYSQL_ROOT_PASSWORD: example
    volumes:
      - maria_volume: /var/lib/mysql
volumes:
  maria_volume: ~/mariadb

我正在阅读github上用golang编写的一些代码,发现了非常有趣的一段代码.我把它简化为清楚.

func  Insert(docs ...interface{}) (err error) {
    for i := 0; i < 3; i++ {
        err = fmt.Errorf("")
        if err.Error()!="EOF" {
            return
        }
    }
    return 
}

我对这里的空回归感到非常困惑......它是如何运作的？他返回nil为错误或中断循环？我明白这个问题看起来很虚伪,但我在go docs中找不到任何关于这个的信息......我也不明白我们如何能够返回错误,正如我所理解的那样,以某种方式宣布回报.(错误错误)是否意味着我们的func中已经有一个错误变量,如果没有指定则用作默认返回值？为什么然后我们隐含地在func的末尾返回错误？

我非常感谢你的解释.

题：

如何代理scrapy请求socks5？

我知道我可以polipo用来将Socks代理转换为Http代理

但：

我想设置一个中间件或一些更改 scrapy.Request

import scrapy

class BaseSpider(scrapy.Spider):
    """a base class that implements major functionality for crawling application"""
    start_urls = ('https://google.com')

    def start_requests(self):

        proxies = {
            'http': 'socks5://127.0.0.1:1080',
            'https': 'socks5://127.0.0.1:1080'
        }

        for url in self.start_urls:
            yield scrapy.Request(
                url=url,
                callback=self.parse,
                meta={'proxy': proxies} # proxy should be string not dict
            )

    def parse(self, response):
        # do ...
        pass

我应该分配给proxies变量什么？

我目前尝试将pgbouncer连接到postgresql，docker-compose但pgbouncer无法连接到postgresql.

我尝试连接到pgbouncer整个Postgresqlbash：

$ sudo docker-compose ps 

        Name                      Command               State           Ports         
--------------------------------------------------------------------------------------
postgres_pgbouncer_1   /opt/pgbouncer/entrypoint.sh     Up      0.0.0.0:6432->6432/tcp
postgres_postgres_1    docker-entrypoint.sh postg ...   Up      0.0.0.0:5432->5432/tcp

$ sudo docker-compose exec postgres bash 
& psql -h pgbouncer -p 6432 -U postgre
psql: ERROR:  no such user: postgres

我在日志中收到此警告pgbouncer：

$ sudo docker-compose logs -f pgbouncer

2019-12-20 08:11:31.802 UTC [1] WARNING C-0x5591f3329fb0: (nodb)/(nouser)@192.168.96.2:40270 pooler error: no such user: postgres

docker-compose.yml

version: '3.4' …

我尝试安装pyqt5但我得到了：

例外：

Collecting pyqt5
  Using cached https://files.pythonhosted.org/packages/3a/fb/eb51731f2dc7c22d8e1a63ba88fb702727b324c6352183a32f27f73b8116/PyQt5-5.14.1.tar.gz
  Installing build dependencies ... done
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/usr/lib/python3.7/tokenize.py", line 447, in open
        buffer = _builtin_open(filename, 'rb')
    FileNotFoundError: [Errno 2] No such file or directory: '/tmp/pip-install-_2yekith/pyqt5/setup.py'

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-_2yekith/pyqt5/

蟒蛇版本：

蟒蛇 3.7.3

点子版本：

pip 18.1 来自 /home/user/pyqt-venv/lib/python3.7/site-packages/pip (python 3.7

题：

这是什么问题，我该如何解决这个问题？

问题：

如何停止名称以 开头的容器server-？

集装箱

> sudo docker-compose ps
                        Name                                      Command               State                        Ports                     
-----------------------------------------------------------------------------------------------------------------------------------------------
server-myservername1_1                                          some commands           Up                                               
server-myservername2_1                                          some commands           Up                                                     
server-myservername3_1                                          some commands           Up                            
server-myservername4_1                                          some commands           Up                     
server-myservername5_1                                          some commands           Up                   
server-myservername6_1                                          some commands           Up                                  
console-myconsolename1_1                                        some commands           Up                             
console-myconsolename2_1                                        some commands           Up                                      

我想redux-form用this.props.changein改变深场redux-form V6。

这是我的mapStateToProps：

function mapStateToProps(state) {
    const {recipient_type, filters} = 
    formValueSelector('form_wizard')(
    state, 'filters.recipient_type' ,'filters');

    return {
        recipient_type,
        filters
    }
}

这是我的componentDidMount（我想以编程方式更改深场）

componentDidMount() {
    if (!this.props.recipient_type) {
        this.props.change("filters.recipient_type}", someThing);
    }
}

的结果this.props.recipient_type未定义。

题：

我怎样才能用this.props.change()in改变深场redux-form？

谢谢

我正在编写一个快速的框架，并且正在使用来自“ pod lib create”命令的模板。在开发窗格中，我已经创建了核心数据模型文件，并且在框架中使用了核心数据。现在我想为此编写单元测试。这是我的单元测试课程代码：

import XCTest
import CoreData
@testable import MyFramework

class MyClassTests: XCTestCase {

    var testPersistentContainer: NSPersistentContainer?

    override func setUp() {
        let persistentStoreDescription = NSPersistentStoreDescription()
        persistentStoreDescription.type = NSInMemoryStoreType

        let container = NSPersistentContainer(name: "MyCoreDataModelFileName")
        container.persistentStoreDescriptions = [persistentStoreDescription]
        container.loadPersistentStores { (storeDescription, error) in
            if let error = error {
                fatalError(error.localizedDescription)
            }
        }

        self.testPersistentContainer = container
    }

    override func tearDown() {

    }

    func testSomething() {
        // the persistent container I'm trying to use is nil
        XCTAssertNotNil(self.testPersistentContainer)
    }
}

我知道出了什么问题，问题是测试目标找不到我的核心数据模型文件，并且当我在示例应用程序目标中创建一个具有适当名称的文件时，上述测试通过了。但

题

测试框架核心数据模型的正确方法是什么？

我使用 python mongo 驱动程序连接到 MongoDB。尽管它也适用于其他任务，但过了一段时间后，我仅针对此任务遇到了以下异常：

附加信息：

• mongodb 有三个分片集群
• 在bulk_write方法中引发的异常

AutoReconnectpymongo.pool in _raise_connection_failure error
mongo-router-3:27017: [Errno 104] Connection reset by peer

这是我的代码：

import mongoengine
from celery.schedules import crontab
from celery.task import Task, PeriodicTask
from pymongo import UpdateOne


def chunker(array, n=10000):
    for i in range(0, len(array), n):
        yield array[i:i + n]


class StatCalculator(Task):
    name = "StatCalculator"
    routing_key = 'my-routing-key'
    soft_time_limit = 3600 * 2
    time_limit = 3600 * 2
    max_retries = 1

    def __init__(self):
        self.col = None

        super(StatCalculator, self).__init__() …

我这样使用port-forwarding：

ssh -vND 1080 user@server_ip

题：

如何使用 docker 镜像socks5？

使用docker pull命令拉取 docker 图像已经在这里有了答案。但我想docker-compose用于拉取图像

当我使用lock.releaselib时fakeredis，出现以下异常：

   File "/usr/local/lib/python3.6/site-packages/redis/lock.py", line 111, in acquire
     if self.do_acquire(token):
   File "/usr/local/lib/python3.6/site-packages/redis/lock.py", line 258, in do_acquire
     client=self.redis))
   File "/usr/local/lib/python3.6/site-packages/redis/client.py", line 2950, in __call__
     return client.evalsha(self.sha, len(keys), *args)
   File "/usr/local/lib/python3.6/site-packages/redis/client.py", line 2079, in evalsha
     return self.execute_command('EVALSHA', sha, numkeys, *keys_and_args)
   File "/usr/local/lib/python3.6/site-packages/redis/client.py", line 667, in execute_command
     connection.send_command(*args)
   File "/usr/local/lib/python3.6/site-packages/redis/connection.py", line 610, in send_command
     self.send_packed_command(self.pack_command(*args))
   File "/usr/local/lib/python3.6/site-packages/redis/connection.py", line 590, in send_packed_command
     self._sock.sendall(item)
   File "/usr/local/lib/python3.6/site-packages/fakeredis/_server.py", line 808, in sendall
     self._parser.send(data)
   File "/usr/local/lib/python3.6/site-packages/fakeredis/_server.py", line 725, in _parse_commands
     self._process_command(fields)
   File "/usr/local/lib/python3.6/site-packages/fakeredis/_server.py", line 827, …