how to append 2 dataframes with same rows code example

Example 1: join on column pandas

# df1 as main df and use the feild from df2 and map it into df1

df1.merge(df2,on='columnName',how='left')

Example 2: combine column in csv python pandas

df['period'] = df[['Year', 'quarter', ...]].agg('-'.join, axis=1)