how to concatenate df in pandas code example

Example 1: combining 2 dataframes pandas

df_3 = pd.concat([df_1, df_2])

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: merge two df

bigdata = pd.concat([data1, data2], ignore_index=True, sort=False)