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


How do I get the number of rows of a pandas dataframe df?


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

Performance plot

Code to reproduce the plot:

import numpy as np
import pandas as pd
import perfplot “out.png”, setup=lambda n: pd.DataFrame(np.arange(n * 3).reshape(n, 3)), n_range=[2**k for k in range(25)], kernels=[ 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”, )

Difference between map, applymap and apply methods in Pandas

How to check if a column exists in Pandas