how to merge to columns in pandas code example

Example 1: pandas merge two columns from different dataframes

#suppose you have two dataframes df1 and df2, and 
#you need to merge them along the column id
df_merge_col = pd.merge(df1, df2, on='id')

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"]