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.venv/Lib/site-packages/altair/examples/density_facet.py

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+"""
+Faceted Density Estimates
+-------------------------
+Density estimates of measurements for each iris flower feature
+"""
+# category: area charts
+
+import altair as alt
+from vega_datasets import data
+
+source = data.iris()
+
+alt.Chart(source).transform_fold(
+    ['petalWidth', 
+     'petalLength', 
+     'sepalWidth', 
+     'sepalLength'], 
+    as_ = ['Measurement_type', 'value']
+).transform_density(
+    density='value', 
+    bandwidth=0.3, 
+    groupby=['Measurement_type'], 
+    extent= [0, 8]
+).mark_area().encode(
+    alt.X('value:Q'), 
+    alt.Y('density:Q'),
+    alt.Row('Measurement_type:N')
+).properties(width=300, height=50)