Sort a pandas DataFrame

import pandas as pd

df = pd.DataFrame({"x": [1, 2, 3, 4, 5], "a": [5, 4, 3, 2, 1]})

df.head()

df.sort_values("a")

a = pd.DataFrame({"x": [1, 2, 3, 4, 5], "y": [5, 4, 3, 2, 1]})

a.head()

a.sort_values("y", inplace=True)
a