使用manage.py运行服务器时收到错误

编程问答 2022-06-03

问题描述

我试图在笔记本电脑上运行服务器，当在控制台中键入“ python manage.py runserver”时 我收到一些错误。可能是我需要导入一些我尝试过'pip install python-cron'的模块，但这没有用。 错误提示：

[2020-11-10 09:04:47,241] autoreload: INFO - Watching for file changes with StatReloader
Exception in thread django-main-thread:
Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py",line 932,in _bootstrap_inner
    self.run()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/threading.py",line 870,in run
    self._target(*self._args,**self._kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/django/utils/autoreload.py",line 53,in wrapper
    fn(*args,**kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/django/core/management/commands/runserver.py",line 109,in inner_run
    autoreload.raise_last_exception()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/django/utils/autoreload.py",line 76,in raise_last_exception
    raise _exception[1]
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/django/core/management/__init__.py",line 357,in execute
    autoreload.check_errors(django.setup)()
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/django/utils/autoreload.py",**kwargs)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/django/__init__.py",line 24,in setup
    apps.populate(settings.INSTALLED_APPS)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/django/apps/registry.py",line 91,in populate
    app_config = AppConfig.create(entry)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/site-packages/django/apps/config.py",line 90,in create
    module = import_module(entry)
  File "/Library/Frameworks/Python.framework/Versions/3.8/lib/python3.8/importlib/__init__.py",line 127,in import_module
    return _bootstrap._gcd_import(name[level:],package,level)
  File "<frozen importlib._bootstrap>",line 1014,in _gcd_import
  File "<frozen importlib._bootstrap>",line 991,in _find_and_load
  File "<frozen importlib._bootstrap>",line 973,in _find_and_load_unlocked
ModuleNotFoundError: No module named 'django_cron'

我拥有的cron.py文件是：

from django.contrib.auth.models import User

import os
import datetime
from crontab import CronTab
#from django_common.helper import send_mail
from django_cron import CronJobBase,Schedule
from .models import Photo
from PIL import Image


class PhotoDeleteCronJob(CronJobBase):

    RUN_EVERY_MINS = 1



    schedule = Schedule(run_every_mins=RUN_EVERY_MINS)
    code = 'cron.PhotoDeleteCronJob'

    def do(self):
        delet = Photo.objects.all()
        delet.delete()

如果需要查看其他文件，请先感谢。

解决方法

如果错过了，请执行以下步骤，

步骤1： pip install django-cron

步骤2： 打开settings.py并将其注册到您的installed_app djnago-cron

步骤3： 您需要通过在settings.py中安装应用程序后进行迁移 python manage.py makemigrations djnago-cron

第4步： 比迁移这些更改 python manage.py migrate

第5步： 现在您可以开始运行，并通过 `python manage.py runserver

,

尝试与此安装django cron 

pip install django-cron

我认为您已经启用了虚拟环境，然后尝试启动服务器 许多人犯了这个错误！！

您必须重新安装Django所需的所有外部库（而不是os math numpy等基本库）

也通过此代码进行迁移

python manage.py makemigrations django-cron

这些都是愚蠢的错误

croncron-taskdjangopython