left merge with Pandas

import pandas as pd
import matplotlib.pyplot as plt
import seaborn as sns
import numpy as np
pd.options.display.max_columns = 30
pd.options.display.float_format = '{:.2f}'.format


df_actors_last = df_actors_last.merge(df[['title', 'revenue_musd', 'vote_average', 'popularity']],
                                      how = 'left', left_index = True, right_index = True)

df_actors_last