combine two columns in one dataframe python code example

Example 1: merge two dataframes based on column

df_outer = pd.merge(df1, df2, on='id', how='outer')

df_outer

Example 2: merge two dataframes based on column

df_merge_col = pd.merge(df_row, df3, on='id')

df_merge_col

Example 3: combine df columns python

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