def _best_fit_font_size(self, family, max_size, bold, italic, font_file):
        if font_file is None:
            font_file = FontFiles.find(family, bold, italic)
        return TextFitter.best_fit_font_size(
            self.text, self._extents, max_size, font_file
        )
Add a relation, only if its name is not already used.
dataset/ETHPy150Open scanny/python-pptx/pptx/text/text.py/TextFrame._best_fit_font_size--crossover with--dataset/ETHPy150Open coursera/dataduct/dataduct/database/database.py/Database.add_relation