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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_plot(self_or_cls, obj, doc=None, renderer=None, **kwargs):
 """ Given a HoloViews Viewable return a corresponding plot instance. Allows supplying a document attach the plot to, useful when combining the bokeh model with another plot. """

        if doc is None:
            doc = Document() if self_or_cls.notebook_context else curdoc()

        if self_or_cls.notebook_context:
            curdoc().theme = self_or_cls.theme
        doc.theme = self_or_cls.theme
        plot = super(BokehRenderer, self_or_cls).get_plot(obj, renderer, **kwargs)
        plot.document = doc
        return plot