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+%22%22%22%0AFilled Step Chart%0A-----------------%0AThis example shows Google's stock price over time as a step chart with its area filled in. %0A%22%22%22%0A# category: line charts%0Aimport altair as alt%0Afrom vega_datasets import data%0A%0Achart = alt.Chart(stocks).encode(%0A    x='date',%0A    y='price'%0A).transform_filter(%0A    alt.datum.symbol == 'GOOG'%0A)%0A%0Aline = chart.mark_line(color=%22darkblue%22)%0Aarea = chart.mark_area(color=%22lightblue%22)%0A%0A(line + area).configure_mark(interpolate='step-after')%0A

Create filled_step_chart.py