Answers for "join two columns in a dataframe pandas"

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')

python dataframe left join

>>> left.merge(right, on='user_id', how='left')

how to merge two column pandas

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