concat columns to a dataframe in pandas code example

Example 1: 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)

Example 2: concat dataframe from list of dataframe

import pandas as pd
df = pd.concat(list_of_dataframes)