text: import os
  import environ
  
  env = environ.Env(
      DEBUG=(bool, False)
  )
  
  environ.Env.read_env(os.path.join(
      os.path.dirname(os.path.dirname(__file__)), '.env'))
  
  # 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/3.0/howto/deployment/checklist/
  
  # SECURITY WARNING: keep the secret key used in production secret!
  SECRET_KEY = env('SECRET_KEY')
  
  # SECURITY WARNING: don't run with debug turned on in production!
  DEBUG = env('DEBUG')
  
  ALLOWED_HOSTS = ['127.0.0.1', 'library-work-at-olist.herokuapp.com']
  
  
  # Application definition
  
  INSTALLED_APPS = [
      'django.contrib.admin',
      'django.contrib.auth',
      'django.contrib.contenttypes',
      'django.contrib.sessions',
      'django.contrib.messages',
      'django.contrib.staticfiles',
      'corsheaders',
      'rest_framework',
      'drf_yasg',
      'django_filters',
      'apps.author',
      'apps.book',
  ]
  
  MIDDLEWARE = [
      'whitenoise.middleware.WhiteNoiseMiddleware',
      '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 = 'core.urls'
  
  TEMPLATES = [
      {
          'BACKEND': 'django.template.backends.django.DjangoTemplates',
          'DIRS': [],
          '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 = 'core.wsgi.application'
  
  
  # Database
  # https://docs.djangoproject.com/en/3.0/ref/settings/#databases
  
  DATABASES = {
      'default': {
          'ENGINE': 'django.db.backends.postgresql',
          'NAME': env('DB_NAME'),
          'USER': env('DB_USER'),
          'PASSWORD': env('DB_PASSWORD'),
          'HOST': env('DB_HOST'),
          'PORT': env('DB_PORT'),
      }
  }
  
  
  # Password validation
  # https://docs.djangoproject.com/en/3.0/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',
      },
  ]
  
  CACHES = {
      'default': {
          'BACKEND': 'django.core.cache.backends.filebased.FileBasedCache',
          'LOCATION': '/tmp/django_cache',
      }
  }
  
  # Internationalization
  # https://docs.djangoproject.com/en/3.0/topics/i18n/
  
  LANGUAGE_CODE = 'pt-br'
  
  TIME_ZONE = 'America/Sao_Paulo'
  
  USE_I18N = True
  
  USE_L10N = True
  
  USE_TZ = True
  
  
  # Static files (CSS, JavaScript, Images)
  # https://docs.djangoproject.com/en/3.0/howto/static-files/
  
  STATIC_ROOT = os.path.join(BASE_DIR, 'static')
  STATIC_URL = '/static/'
  
  STATICFILES_STORAGE = 'whitenoise.storage.CompressedManifestStaticFilesStorage'
  
  CORS_ORIGIN_ALLOW_ALL = True
  
  REST_FRAMEWORK = {
      'DEFAULT_PERMISSION_CLASSES': [
          'rest_framework.permissions.AllowAny'
      ],
      'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.LimitOffsetPagination',
      'PAGE_SIZE': 25,
      'TEST_REQUEST_DEFAULT_FORMAT': 'json',
      'DEFAULT_FILTER_BACKENDS': ['django_filters.rest_framework.DjangoFilterBackend'],
  }
  