def line(self, source, x, y, agg=None):
        from .glyphs import Line
        from .reductions import any
        if agg is None:
            agg = any()
        return bypixel(source, self, Line(x, y), agg)
Gets the caption for the tab.
dataset/ETHPy150Open bokeh/datashader/datashader/core.py/Canvas.line--crossover with--dataset/ETHPy150Open rwl/muntjac/muntjac/ui/tab_sheet.py/ITab.getCaption