merge to coloums in pandas code example

Example 1: how to merge two pandas dataframes on a column

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

Example 2: merge two columns pandas

df["period"] = df["Year"] + df["quarter"]

Example 3: how to merge two column pandas

DataFrame["new_column"] = DataFrame["column1"] + DataFrame["column2"]