venv/lib/python3.10/site-packages/altair/examples/falkensee.py

"""
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(
    alt.X('year:T', axis=alt.Axis(format='%Y')),
    y='population'
).properties(
    width=500,
    height=300
)

point = line.mark_point(color='#333')

rect = alt.Chart(source2).mark_rect().encode(
    x='start:T',
    x2='end:T',
    color='event:N'
)

rect + line + point