Answers for "pandas combine two data frame"

merge two dataframes based on column

df_outer = pd.merge(df1, df2, on='id', how='outer') #here id is common column

df_outer

merge two df

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

how to join two dataframe in pandas based on two column

merged_df = left_df.merge(right_df, how='inner', left_on=["A", "B"], right_on=["A2","B2"])