def load(self, filename, create_if_missing=True):
        filename = Path(filename)
        if not filename.exists() and create_if_missing:
            self.load_pip_requirements()
            with filename.open("w") as f:
                f.write(yaml.dump(self.serialized, default_flow_style=False,
                                  encoding=None))
            self.filename = filename
            return self.save(filename)
        with filename.open() as f:
            for group, requirements in yaml.load(f.read()).items():
                for requirement in requirements:
                    self[group].add(Requirement.coerce(requirement))
        self.filename = filename
def _ui_font_style(layout, font_style):

        split = layout.split()

        col = split.column()
        col.label(text="Kerning Style:")
        col.row().prop(font_style, "font_kerning_style", expand=True)
        col.prop(font_style, "points")

        col = split.column()
        col.label(text="Shadow Offset:")
        col.prop(font_style, "shadow_offset_x", text="X")
        col.prop(font_style, "shadow_offset_y", text="Y")

        col = split.column()
        col.prop(font_style, "shadow")
        col.prop(font_style, "shadow_alpha")
        col.prop(font_style, "shadow_value")

        layout.separator()