code: def set_field_at(self, index, *, name, value, inline=True):
          
  
          try:
              field = self._fields[index]
          except (TypeError, IndexError, AttributeError):
              raise IndexError('field index out of range')
  
          field['name'] = str(name)
          field['value'] = str(value)
          field['inline'] = inline
          return self
docs: Modifies a field to the embed object.
  
          The index must point to a valid pre-existing field.
  
          This function returns the class instance to allow for fluent-style
          chaining.
  
          Parameters
          -----------
          index: :class:`int`
              The index of the field to modify.
          name: :class:`str`
              The name of the field.
          value: :class:`str`
              The value of the field.
          inline: :class:`bool`
              Whether the field should be displayed inline.
  
          Raises
          -------
          IndexError
              An invalid index was provided.