How do I style only the last row of a pandas dataframe?

Question

I can style a pandas dataframe:

import pandas as pd
import numpy as np
import seaborn as sns
cm = sns.diverging_palette(-5, 5, as_cmap=True)

df = pd.DataFrame(np.random.randn(3, 4))
df.style.background_gradient(cmap=cm)

but I can't figure out how to only apply a style to the last row. There is a subset option in the background_gradient call, and it suggests that I use an index slice but I cannot figure out how to make just the last row have any kind of styling.

Here is my closest to success:

df.style.background_gradient(cmap=cm, subset=[2], axis='index')

Answer 1

Use the last element of your index as your subset.

df.style.background_gradient(cmap=cm, axis=1, subset=df.index[-1])

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Answer 2

You could also use pd.IndexSlice which is useful if you want to apply the style to multiple rows, including the last:

import pandas as pd
import numpy as np
import seaborn as sns


cm = sns.diverging_palette(-5, 5, as_cmap=True)
df = pd.DataFrame(np.random.randn(3, 4))

indices = pd.IndexSlice[[0, df.last_valid_index()], :]
df.style.background_gradient(cmap=cm, axis=1, subset=indices)