[Django]-How to get xml format in Django Rest Framework

Actually your settings.py is missing the xml parser config.

1. install rest_framework_xml : pip install djangorestframework-xml
2. Update INSTALLED_APPS in settings.py

INSTALLED_APPS = [
  'django.contrib.admin',
  'django.contrib.auth',
  'django.contrib.contenttypes',
  'django.contrib.sessions',
  'django.contrib.messages',
  'django.contrib.staticfiles',
  'rest_framework',
  'rest_framework_xml',
  'books',
  'users',
]

3. Add xml parser in settings.py:

REST_FRAMEWORK = {
  'DEFAULT_PARSER_CLASSES': (
    'rest_framework_xml.parsers.XMLParser',
  ),
    'DEFAULT_RENDERER_CLASSES': (
    'rest_framework_xml.renderers.XMLRenderer',
  ),
}