new_contents: """
  Scatter Plots with alternate Y axis scale
  ---------------------------------
  A few examples that make use of alternate Y axis scales.
  """
  # category: simple charts
  
  import altair as alt
  import numpy as np
  import pandas as pd
  
  chart_df = pd.DataFrame(
      {
          'x': list(range(0,20)),
          'y': [2** x for x in range(0,20)],
      }
  )
  base_chart =  alt.Chart(chart_df).mark_line().encode(
      x=alt.X('x', type='quantitative'),
  ).properties(
      height=200,
      width=200,
  )
  chart1 = base_chart.encode(
      y=alt.Y('y', type='quantitative'),
  ).properties(title='linear')
  chart2 = base_chart.encode(
      y=alt.Y('y', type='quantitative', scale=alt.Scale(type='log', base=2)),
  ).properties(title='log base 2')
  chart3 = base_chart.encode(
      y=alt.Y('y', type='quantitative', scale=alt.Scale(type='log', base=np.e)),
  ).properties(title='log base e')
  chart4 = base_chart.encode(
      y=alt.Y('y', type='quantitative', scale=alt.Scale(type='log')),
  ).properties(title='log base 10')
  display(chart1 | chart2 | chart3 | chart4)
  
subject: Add example for alternate axes scale.