Django项目运行报错：ModuleNotFoundError: No module named '"travelApp'求助

我用Django开发Web应用，执行py manage.py runserver和py manage.py migrate命令时，均出现以下错误：

ModuleNotFoundError: No module named '"travelApp'

travelApp是我的项目名称而非模块，不清楚为何会被当作模块处理。以下是我的settings.py文件内容：

"""
Django settings for travelApp project.

Generated by 'django-admin startproject' using Django 2.2.

For more information on this file, see
https://docs.djangoproject.com/en/2.2/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/2.2/ref/settings/
"""

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__)))
CSRF_COOKIE_HTTPONLY = True


# 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 = 'i1kf*^g1+dt*8n9bgcl80$d!970186x(x(9z2)7dfy1ynlxixn'

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

ALLOWED_HOSTS = ['127.0.0.1']

EMAIL_HOST_USER = "koolfacts67@gmail.com"
EMAIL_HOST_PASSWORD = "m80222jms"

# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'crispy_forms',
    'django.contrib.staticfiles',
    'sights.apps.SightsConfig',
    'itineraries.apps.ItinerariesConfig',
]

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 = 'travelApp.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'static')],
        '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',
            ],
        },
    },
]

TEMPLATE_DIRS = (
  '/home/django/myproject/templates',
)

WSGI_APPLICATION = 'travelApp.wsgi.application'


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

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.postgresql',
        'NAME': 'railway',
        'USER': 'postgres',
        'PASSWORD': 'dRfHDaVZymxUWsZzCRtq',
        'HOST': 'containers-us-west-182.railway.app',
        'PORT': '6045',
    }
}

# 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 = 'US/Central'

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/'
STATIC_ROOT = os.path.join(BASE_DIR, '/static')

STATICFILES_DIRS = [os.path.join(BASE_DIR, "static/")]

问题原因及解决办法 #

错误信息里的"travelApp多了一个前双引号，这是核心问题——某个配置或命令里把项目名写成了带多余引号的形式，导致Django误把"travelApp当作模块名去查找。按以下步骤排查：

1. 检查manage.py文件
   打开项目根目录下的manage.py，确认其中设置DJANGO_SETTINGS_MODULE的代码没有多余引号，正确格式应该是：

   os.environ.setdefault('DJANGO_SETTINGS_MODULE', 'travelApp.settings')
   

   如果这里写成了'"travelApp.settings'之类的，把多余的引号删掉。

2. 检查启动命令
   确认你执行命令时没有手动添加带错误引号的--settings参数，比如不要写成：

   py manage.py runserver --settings='"travelApp.settings'
   

   如果有，去掉多余的引号。

3. 确认项目目录结构
   确保项目根目录（即manage.py所在目录）下存在travelApp文件夹，且该文件夹内包含__init__.py、urls.py、wsgi.py和settings.py这几个必要文件。

4. 确认工作目录
   执行命令时，必须在项目根目录下运行，不要进入travelApp子目录再执行py manage.py runserver。

内容的提问来源于stack exchange，提问作者kool