pandas concat inner join code example

Example 1: concat dataframe from list of dataframe

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

Example 2: how to merge two pandas dataframes on a column

import pandas as pd
T1 = pd.merge(T1, T2, on=T1.index, how='outer')

Example 3: python dataframe left join

>>> left.merge(right, on='user_id', how='left')