  # Choice types...
  
  class ChoiceField(Field):
      default_error_messages = {
          'invalid_choice': _('`{input}` is not a valid choice.')
      }
  
      def __init__(self, choices, **kwargs):
          # Allow either single or paired choices style:
          # choices = [1, 2, 3]
 
</s> remove         'invalid_choice': _('`{input}` is not a valid choice.'),
        'not_a_list': _('Expected a list of items but got type `{input_type}`.')
 </s> add         'invalid_choice': _('"{input}" is not a valid choice.'),
        'not_a_list': _('Expected a list of items but got type "{input_type}".') </s> remove         'invalid': _('`{input}` is not a valid boolean.')
 </s> add         'invalid': _('"{input}" is not a valid boolean.') </s> remove         'not_a_list': _('Expected a list of items but got type `{input_type}`.')
 </s> add         'not_a_list': _('Expected a list of items but got type "{input_type}".') </s> remove         'not_a_list': _('Expected a list of items but got type `{input_type}`.')
 </s> add         'not_a_list': _('Expected a list of items but got type "{input_type}".') </s> remove         'invalid': _('`{input}` is not a valid boolean.')
 </s> add         'invalid': _('"{input}" is not a valid boolean.')
        'invalid_choice': _('"{input}" is not a valid choice.')
  # Choice types...
  
  class ChoiceField(Field):
      default_error_messages = {
        'invalid_choice': _('"{input}" is not a valid choice.')
      }
  
      def __init__(self, choices, **kwargs):
          # Allow either single or paired choices style:
          # choices = [1, 2, 3]
keep keep keep keep replace keep keep keep keep keep
 swap backticks for double quotes 
rest_framework/fields.py