axis label in Bokeh

p = figure(x_axis_label="Initial y-axis label",
           y_axis_label="Initial x-axis label")

# ...RC-use this when more than one Y axis in the plot labeling each axis independently

# p.xaxis and p.yaxis are lists. To operate on actual the axes,
# we need to extract them from the lists first.
callback = CustomJS(args=dict(xaxis=p.xaxis[0],
                              yaxis=p.yaxis[0]), code="""
    xaxis.axis_label = "Updated x-axis label";
    yaxis.axis_label = "Updated y-axis label";
""")