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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def get_styles(self, style=None):
 """ Returns SFrame of style images used for training the model Parameters style: int or list, optional The selected style or list of styles to return. If `None`, all styles will be returned See Also -------- stylize Examples -------- Columns: style int image Image Rows: 4 Data: | style | image | | 0 | Height: 642 Width: 642 | | 1 | Height: 642 Width: 642 | | 2 | Height: 642 Width: 642 | | 3 | Height: 642 Width: 642 | """


        style, _ = self._style_input_check(style)
        return self.styles.filter_by(style, self._index_column)