code: def _prevent_default_initializer_splitting(self, item, indent_amt):
          
          if unicode(item) == '=':
              # This is the assignment in the initializer. Just remove spaces for
              # now.
              self._delete_whitespace()
              return
  
          if (not self._prev_item or not self._prev_prev_item or
                  unicode(self._prev_item) != '='):
              return
  
          self._delete_whitespace()
          prev_prev_index = self._lines.index(self._prev_prev_item)
  
          if (
              isinstance(self._lines[prev_prev_index - 1], self._Indent) or
              self.fits_on_current_line(item.size + 1)
          ):
              # The default initializer is already the only item on this line.
              # Don't insert a newline here.
              return
  
          # Replace the space with a newline/indent combo.
          if isinstance(self._lines[prev_prev_index - 1], self._Space):
              del self._lines[prev_prev_index - 1]
  
          self.add_line_break_at(self._lines.index(self._prev_prev_item),
                                 indent_amt)
docs: Prevent splitting between a default initializer.
  
          When there is a default initializer, it's best to keep it all on
          the same line. It's nicer and more readable, even if it goes
          over the maximum allowable line length. This goes back along the
          current line to determine if we have a default initializer, and,
          if so, to remove extraneous whitespaces and add a line
          break/indent before it if needed.