old_contents: """
  Falkensee
  -----------------------
  This example is a reproduction of the Falkensee plot found in the vega-lite examples.
  """
  # category: case studies
  import altair as alt
  
  source = [
      {"year": "1875", "population": 1309},
      {"year": "1890", "population": 1558},
      {"year": "1910", "population": 4512},
      {"year": "1925", "population": 8180},
      {"year": "1933", "population": 15915},
      {"year": "1939", "population": 24824},
      {"year": "1946", "population": 28275},
      {"year": "1950", "population": 29189},
      {"year": "1964", "population": 29881},
      {"year": "1971", "population": 26007},
      {"year": "1981", "population": 24029},
      {"year": "1985", "population": 23340},
      {"year": "1989", "population": 22307},
      {"year": "1990", "population": 22087},
      {"year": "1991", "population": 22139},
      {"year": "1992", "population": 22105},
      {"year": "1993", "population": 22242},
      {"year": "1994", "population": 22801},
      {"year": "1995", "population": 24273},
      {"year": "1996", "population": 25640},
      {"year": "1997", "population": 27393},
      {"year": "1998", "population": 29505},
      {"year": "1999", "population": 32124},
      {"year": "2000", "population": 33791},
      {"year": "2001", "population": 35297},
      {"year": "2002", "population": 36179},
      {"year": "2003", "population": 36829},
      {"year": "2004", "population": 37493},
      {"year": "2005", "population": 38376},
      {"year": "2006", "population": 39008},
      {"year": "2007", "population": 39366},
      {"year": "2008", "population": 39821},
      {"year": "2009", "population": 40179},
      {"year": "2010", "population": 40511},
      {"year": "2011", "population": 40465},
      {"year": "2012", "population": 40905},
      {"year": "2013", "population": 41258},
      {"year": "2014", "population": 41777},
  ]
  
  source2 = [
      {"start": "1933", "end": "1945", "event": "Nazi Rule"},
      {"start": "1948", "end": "1989", "event": "GDR (East Germany)"},
  ]
  
  
  source = alt.pd.DataFrame(source)
  source2 = alt.pd.DataFrame(source2)
  
  
  line = alt.Chart(source).mark_line(color="#333").encode(
      x=alt.X("year:T", axis=alt.Axis(format="%Y"), title="Year"),
      y=alt.Y("population", title="Population"),
  )
  
  point = line.mark_point(color="#333")
  
  rect = alt.Chart(source2).mark_rect().encode(
      x="start:T",
      x2="end:T",
      color=alt.Color("event:N", title="Event")
  )
  
  (rect + line + point).properties(
        title="Population of Falkensee from 1875 to 2014",
        width=500,
        height=300
  )
  
new_contents: """
  Population of Falkensee from 1875 to 2014
  -----------------------------------------
  This example is a reproduction of the Falkensee plot found in the Vega-Lite examples.
  """
  # category: case studies
  import altair as alt
  
  source = [
      {"year": "1875", "population": 1309},
      {"year": "1890", "population": 1558},
      {"year": "1910", "population": 4512},
      {"year": "1925", "population": 8180},
      {"year": "1933", "population": 15915},
      {"year": "1939", "population": 24824},
      {"year": "1946", "population": 28275},
      {"year": "1950", "population": 29189},
      {"year": "1964", "population": 29881},
      {"year": "1971", "population": 26007},
      {"year": "1981", "population": 24029},
      {"year": "1985", "population": 23340},
      {"year": "1989", "population": 22307},
      {"year": "1990", "population": 22087},
      {"year": "1991", "population": 22139},
      {"year": "1992", "population": 22105},
      {"year": "1993", "population": 22242},
      {"year": "1994", "population": 22801},
      {"year": "1995", "population": 24273},
      {"year": "1996", "population": 25640},
      {"year": "1997", "population": 27393},
      {"year": "1998", "population": 29505},
      {"year": "1999", "population": 32124},
      {"year": "2000", "population": 33791},
      {"year": "2001", "population": 35297},
      {"year": "2002", "population": 36179},
      {"year": "2003", "population": 36829},
      {"year": "2004", "population": 37493},
      {"year": "2005", "population": 38376},
      {"year": "2006", "population": 39008},
      {"year": "2007", "population": 39366},
      {"year": "2008", "population": 39821},
      {"year": "2009", "population": 40179},
      {"year": "2010", "population": 40511},
      {"year": "2011", "population": 40465},
      {"year": "2012", "population": 40905},
      {"year": "2013", "population": 41258},
      {"year": "2014", "population": 41777},
  ]
  
  source2 = [
      {"start": "1933", "end": "1945", "event": "Nazi Rule"},
      {"start": "1948", "end": "1989", "event": "GDR (East Germany)"},
  ]
  
  
  source = alt.pd.DataFrame(source)
  source2 = alt.pd.DataFrame(source2)
  
  
  line = alt.Chart(source).mark_line(color="#333").encode(
      x=alt.X("year:T", axis=alt.Axis(format="%Y"), title="Year"),
      y=alt.Y("population", title="Population"),
  )
  
  point = line.mark_point(color="#333")
  
  rect = alt.Chart(source2).mark_rect().encode(
      x="start:T",
      x2="end:T",
      color=alt.Color("event:N", title="Event")
  )
  
  (rect + line + point).properties(
        title="Population of Falkensee from 1875 to 2014",
        width=500,
        height=300
  )
  
subject: Update falkensee.py