Make multiple copies of each row

multiply_rows

import numpy as np

def multiply_rows(df, n, group=True):
    """Make multiple copies of each row in pandas.
    
    :param df: the dataframe
    :param n: how many copies
    :param group: whether to group copies next to each other (AABB) or not (ABAB)
    """
    new_df = pd.DataFrame()
    for col in df:
        series = df[col]
        if group:
            new_df[col] = np.broadcast_to(series, (n,) + series.shape).T.flatten()
        else:
            new_df[col] = np.broadcast_to(series, (n,) + series.shape).flatten()
    return new_df