from bokeh.layouts import column
from bokeh.models import CustomJS, Slider, ColumnDataSource
from bokeh.plotting import figure
from bokeh.io import show

source = ColumnDataSource(data=dict(x=[x/100.0 for x in range(0, 1000)], y=[x/100.0 for x in range(0, 1000)]))

plot = figure()
plot.line('x', 'y', source=source)
power_slider = Slider(start=0.1, end=5, value=1, step=.1, title="Power")

callback = CustomJS(args=dict(source=source, power_slider=power_slider),
                    code = """
    const x = source.data['x'];
    const y = source.data['y'];
    for(let i = 0; i < x.length; i++) {
        y[i] = Math.pow(x[i], power_slider.value);
    }
    source.change.emit();
""")

power_slider.js_on_change('value', callback)

show(column(plot, power_slider))