old_contents: """
  Line Chart with Percent axis
  ----------------------------
  This example shows how to format the tick labels of the y-axis of a chart as percentages.
  """
  # category: line charts
  import altair as alt
  import pandas as pd
  from vega_datasets import data
  
  source = data.jobs.url
  
  alt.Chart(source).mark_line().encode(
      alt.X('year:O'),
      alt.Y('perc:Q', axis=alt.Axis(format='%')),
      color='sex:N'
  ).transform_filter(
      alt.datum.job == 'Welder'
  )
  
new_contents: """
  Line Chart with Percent axis
  ----------------------------
  This example shows how to format the tick labels of the y-axis of a chart as percentages.
  """
  # category: line charts
  import altair as alt
  from vega_datasets import data
  
  source = data.jobs.url
  
  alt.Chart(source).mark_line().encode(
      alt.X('year:O'),
      alt.Y('perc:Q', axis=alt.Axis(format='%')),
      color='sex:N'
  ).transform_filter(
      alt.datum.job == 'Welder'
  )
  
subject: remove unused import in example