old_contents: import string
  
  from django.conf import settings
  
  
  # Default backend used to for get_connection() function.
  DEFAULT_BACKEND = getattr(settings, 'BREVISURL_BACKEND', 'brevisurl.backends.local.BrevisUrlBackend')
  
  # Domain that is used to create shortened urls.
  LOCAL_BACKEND_DOMAIN = getattr(settings, 'BREVISURL_BACKEND_LOCAL_DOMAIN', None) or getattr(settings, 'BREVISURL_LOCAL_BACKEND_DOMAIN', None)
  
  # Characters that are used to generate tokens for local backend.
  LOCAL_BACKEND_TOKEN_CHARS = getattr(settings, 'BREVISURL_LOCAL_BACKEND_TOKEN_CHARS', list(string.ascii_letters + string.digits))
  
  # Settings for token length.
  LOCAL_BACKEND_TOKEN_LENGTH = getattr(settings, 'BREVISURL_LOCAL_BACKEND_TOKEN_LENGTH', 5)
  
  # Settings for url max length.
  LOCAL_BACKEND_ORIGINAL_URL_MAX_LENGTH = getattr(settings, 'SHORTURL_LOCAL_BACKEND_ORIGINAL_URL_MAX_LENGTH', 200)
  
  # Settings for url pattern.
  LOCAL_BACKEND_URL_PATTERN = getattr(settings, 'BREVISURL_LOCAL_BACKEND_URL_PATTERN',
                                      r'^(?P<token>[a-zA-Z0-9]{' + str(LOCAL_BACKEND_TOKEN_LENGTH) + r'})$')
  # Protocol for local backend.
  LOCAL_BACKEND_DOMAIN_PROTOCOL = getattr(settings, 'BREVISURL_LOCAL_BACKEND_DOMAIN_PROTOCOL', 'http')
  
new_contents: import string
  
  from django.conf import settings
  
  
  # Default backend used to for get_connection() function.
  DEFAULT_BACKEND = getattr(settings, 'BREVISURL_BACKEND', 'brevisurl.backends.local.BrevisUrlBackend')
  
  # Domain that is used to create shortened urls.
  LOCAL_BACKEND_DOMAIN = getattr(settings, 'BREVISURL_BACKEND_LOCAL_DOMAIN', None) or getattr(settings, 'BREVISURL_LOCAL_BACKEND_DOMAIN', None)
  
  # Characters that are used to generate tokens for local backend.
  LOCAL_BACKEND_TOKEN_CHARS = getattr(settings, 'BREVISURL_LOCAL_BACKEND_TOKEN_CHARS', list(string.ascii_letters + string.digits))
  
  # Settings for token length.
  LOCAL_BACKEND_TOKEN_LENGTH = getattr(settings, 'BREVISURL_LOCAL_BACKEND_TOKEN_LENGTH', 5)
  
  # Settings for url max length.
  LOCAL_BACKEND_ORIGINAL_URL_MAX_LENGTH = getattr(settings, 'BREVISURL_LOCAL_BACKEND_ORIGINAL_URL_MAX_LENGTH', 200)
  
  # Settings for url pattern.
  LOCAL_BACKEND_URL_PATTERN = getattr(settings, 'BREVISURL_LOCAL_BACKEND_URL_PATTERN',
                                      r'^(?P<token>[a-zA-Z0-9]{' + str(LOCAL_BACKEND_TOKEN_LENGTH) + r'})$')
  # Protocol for local backend.
  LOCAL_BACKEND_DOMAIN_PROTOCOL = getattr(settings, 'BREVISURL_LOCAL_BACKEND_DOMAIN_PROTOCOL', 'http')
  
subject: fix variable naming for matching the document