code: def scb(attr, old, new):
      source.data["y"] = new * y
  
imports: import numpy
  from bokeh.events import ButtonClick
  from bokeh.io import curdoc
  from bokeh.layouts import column, row
  from bokeh.models import Button, ColumnDataSource, Div, Slider
  from bokeh.plotting import figure
label_desc: Use image node_id 1 for calling a global function with example usage: scb(attr, old, new) without return types