Binning

df = pd.DataFrame({
    "units": [12, 7, 9, 4, 11, 3, 14, 8],
    "shillings": [1260, 1540, 945, 880, 1155, 660, 1470, 1760],
    "city": ["Nairobi", "Nairobi", "Mombasa", "Mombasa", "Kisumu", "Kisumu", "Nakuru", "Eldoret"],
})
chart = (alt.Chart(df).mark_bar().encode(x=alt.X("shillings:Q", bin=alt.Bin(maxbins=6)), y="count()")).properties(width=360, height=220, title='bin')
chart.show()
print('bin')

df = pd.DataFrame({
    "units": [12, 7, 9, 4, 11, 3, 14, 8],
    "shillings": [1260, 1540, 945, 880, 1155, 660, 1470, 1760],
    "city": ["Nairobi", "Nairobi", "Mombasa", "Mombasa", "Kisumu", "Kisumu", "Nakuru", "Eldoret"],
})
(alt.Chart(df).mark_bar().encode(x=alt.X("shillings:Q", bin=alt.Bin(maxbins=6)), y="count()")).properties(width=320, height=200).show()
print("again")

df = pd.DataFrame({
    "city": ["Nairobi", "Mombasa", "Kisumu", "Nakuru", "Eldoret"],
    "units": [21, 15, 15, 18, 12],
    "shillings": [2100, 1500, 1480, 1750, 1190],
})
alt.Chart(df).mark_bar().encode(x="city:N", y="units:Q").show()
print("bar")

print('bin')