How do I get the row count of a Pandas DataFrame?

For a dataframe df, one can use any of the following:

Code to reproduce the plot:

import numpy as np
import pandas as pd
import perfplot
    setup=lambda n: pd.DataFrame(np.arange(n * 3).reshape(n, 3)),
    n_range=[2**k for k in range(25)],
        lambda df: len(df.index),
        lambda df: df.shape[0],
        lambda df: df[df.columns[0]].count(),
    labels=["len(df.index)", "df.shape[0]", "df[df.columns[0]].count()"],
    xlabel="Number of rows",

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