所以我正在使用Django 2.26版和Python 3.7.3版。每当我尝试在项目中的应用程序中导入或包括外部库时（在这种情况下，尤其是background_task，但此错误适用于celery和其他许多错误），即使安装了该模块，它也会显示“未命名模块”。而当我运行Django shell并导入它时就可以使用。

我的settings.py文件如下：

import os

# Build paths inside the project like this: os.path.join(BASE_DIR,...)
BASE_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/2.2/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = # removed here

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = True

ALLOWED_HOSTS = [
    '*',]
# Application definition

INSTALLED_APPS = [
    'django.contrib.admin','django.contrib.auth','django.contrib.contenttypes','django.contrib.sessions','django.contrib.messages','django.contrib.staticfiles','background_task','projects','blog','landingpage','workspace',]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware','django.contrib.sessions.middleware.Sessionmiddleware','django.middleware.common.Commonmiddleware','django.middleware.csrf.CsrfViewMiddleware','django.contrib.auth.middleware.Authenticationmiddleware','django.contrib.messages.middleware.MessageMiddleware','django.middleware.clickjacking.XFrameOptionsMiddleware',]

ROOT_urlconf = 'portfolio.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates','DIRS': ["portfolio/templates/"],'APP_DIRS': True,'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug','django.template.context_processors.request','django.contrib.auth.context_processors.auth','django.contrib.messages.context_processors.messages',],},]

WSGI_APPLICATION = 'portfolio.wsgi.application'


# Database
# https://docs.djangoproject.com/en/2.2/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3','NAME': os.path.join(BASE_DIR,'db.sqlite3'),}
}


# Password validation
# https://docs.djangoproject.com/en/2.2/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        'NAME': 'django.contrib.auth.password_validation.UserAttributeSimilarityValidator',{
        'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator',{
        'NAME': 'django.contrib.auth.password_validation.CommonPasswordValidator',{
        'NAME': 'django.contrib.auth.password_validation.NumericPasswordValidator',]


# Internationalization
# https://docs.djangoproject.com/en/2.2/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_L10N = True

USE_TZ = True


# Static files (CSS,JavaScript,Images)
# https://docs.djangoproject.com/en/2.2/howto/static-files/

STATIC_URL = "/static/"
LOGIN_REDIRECT_URL = '/workspace/'
EMAIL_BACKEND = 'django.core.mail.backends.console.EmailBackend'