Examples
An example of an actual empty DataFrame where the index is empty:

import numpy as np
import pandas as pd

df_empty = pd.DataFrame({'P' : []})
df_empty

	P

df_empty.empty

True

If we only have NaNs in our DataFrame, it is not considered empty! We will need to drop
the NaNs to make the DataFrame empty:

df = pd.DataFrame({'P' : [np.nan]})
df

	P
0	NaN

df.empty

False

df.dropna().empty

True