title: How to extend the settings file in Django?
body: <p>I'm using  <a href="https://django-constance.readthedocs.io/en/latest/index.html#constance-dynamic-django-settings" rel="nofollow noreferrer">Constance - Dynamic Django settings</a> to configure some values in my project.
  according to Constance, I should add all the configurations in the settings.py file.
  but I need to separate this configuration in another file.
  I tried to extend the settings file by doing the code below, but it didn't work 
  it is not reading the value from that new file.</p>
  
  <pre><code>from .settings import *
  
  
  CONSTANCE_ADDITIONAL_FIELDS = {
  'corres_format_select': ['django.forms.fields.ChoiceField', {
      'widget': 'django.forms.Select',
      'choices': (("xx - xx", "xx - xx"), ("xx/xx", "xx/xx"), ("xx : xx", "xx : xx"))}],
  
  'date_format_select': ['django.forms.fields.ChoiceField', {
      'widget': 'django.forms.Select',
      'choices': (("dd/mm/yyyy", "dd/mm/yyyy"), ("mm/dd/yyyy", "mm/dd/yyyy"), ("dd-mm-yyyy", "dd-mm-yyyy"))}],
  }
  
  CONSTANCE_CONFIG = {
  'Correspondence_format': ("xx - xx", 'Choose the correspondce format', 'corres_format_select'),
  'Date_format': ("dd/mm/yyyy", 'Choose the date format', 'date_format_select'),
  } 
  </code></pre>