Answers for "merge on index several dataframes pandas"

merge on index pandas

pd.merge(df1, df2, left_index=True, right_index=True)

pandas merge multiple dataframes

import pandas as pd
from functools import reduce

# compile the list of dataframes you want to merge
data_frames = [df1, df2, df3]
df_merged = reduce(lambda  left,right: pd.merge(left,right,on=['key_col'],
                                            how='outer'), data_frames)